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Topic: gear/diff swap (Read 7525 times) previous topic - next topic

gear/diff swap

Reply #15
As mentioned before, going from 2.73's to 4.10's, you should notice a very definite difference. Sounds like you got f*cked...

Then again, you have one bad-ass car that can do what no other Thunderbird can.  :rolleyes:
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

gear/diff swap

Reply #16
Quote from: Seek;336063
That makes no sense - gearing is gearing. If you have to shift every second, sure it'll slow you down, but gearing will always speed you up in your engine's power band. Now if your motor runs out of steam at 4000 rpm's and you're already in your 1:1 transmission gear, yes you'll slow down above that but everything below will have a huge performance improvement with 4.10's over 2.73's.



It'd still be quicker (with traction) in all gears - you'll just run out of power sooner as you use up all the gearing.

Also, what are you claiming would be "slower"? Quarter mile? I would agree that with a stock 5.0 SO revving engine would only benefit from about 3.55's with an aod and 3.31's with a t5 - if I remember right, the stock SO 5.0 does die off at 4k, although with my old tired one, it felt like it fell apart at 3.5k.

In the 1/8, 4.10's would work much better, with traction.

His 4.10's should have a huge seat-of-pants feel improvement.


thank you for that reply, I can't believe people say  they have no experience with!!!! probably the #1 performance upgrade is GEARS!!!
1986 T-bird
347 stroker motor
185 AFR Heads
TrickFlow cam 224/232-542/563
Victor Jr. intake CNC ported
Quickfuel Holley 800 cfm
Hooker 1-3/4 long tubes
Custom built AOD
B&M 3000 stall
8.8 w/4.30 gears
UPR K-member,A-Arms,and coil-overs
UPR upper/lower control arms
Strange shocks/struts
26x10x15 M/T slicks
11.48@119.27
(coming soon Tremec 3550)
The Finished Product
http://s174.photobucket.com/albums/w92/03grinnie/T-bird/

gear/diff swap

Reply #17
347Blunder....I have plenty of experience with gears.  With his combination...redneck thinking like yours is why so many people have the "bigger is better" complex.

More gear is better, isn't always the case.

My old SD AOD with 3.73's ran the same quarter and 1/8 times as my current MAF 351 T5 with 3.73's....and the 351 makes a bit more power and a ton more torque.  The 351 hooks up better with the 3.73's than the AOD car would....the 60' difference is only about .1 at most and this car is a bit heavier than the old one.

A car can "feel" a lot quicker without actually being quicker....FEEL is totally and completely subjective...what may feel like a HUGE difference to some may feel like a negligible difference to others.


Good luck,
Don
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

gear/diff swap

Reply #18
Quote from: Sick88Tbird;336633
347Blunder....I have plenty of experience with gears.  With his combination...redneck thinking like yours is why so many people have the "bigger is better" complex.

More gear is better, isn't always the case.

My old SD AOD with 3.73's ran the same quarter and 1/8 times as my current MAF 351 T5 with 3.73's....and the 351 makes a bit more power and a ton more torque.  The 351 hooks up better with the 3.73's than the AOD car would....the 60' difference is only about .1 at most and this car is a bit heavier than the old one.

A car can "feel" a lot quicker without actually being quicker....FEEL is totally and completely subjective...what may feel like a HUGE difference to some may feel like a negligible difference to others.


Good luck,
Don


Just out of curiosity are you saying steeper gears wont make a car quicker out of the hole ?That torque multiplication is irrelevant?

I'm just trying to understand here

Or are you saying TOO much gear on a given combo can be detrimental?
 I have always been under the impression that the best "bang for the buck" modification someone could do to make a car quicker, say 0-60 was steeper gears.
 Now I suppose I could be mistaken , but if that is the case I know a ton of other people who would love to know they are also wrong .

Please clarify what you are saying , and  please try to refrain from name calling , I am seeking insight not insults .
Fox-less at the moment

gear/diff swap

Reply #19
Quote from: Dougy_Fresh;336176
i had 2.73/tracloc before, 4.10/open now...

it runs good and pulls hard up to 6000rpms, it just doesnt seem like it accelerates any faster than before....wierd thing is it still hooks up...i just launched it at 4000rpm's in first and it only spun for a split second and it hooked and took off...


4.10's will hook better than a numerically lower gear

gear/diff swap

Reply #20
Quote from: Sick88Tbird;336633
My old SD AOD with 3.73's ran the same quarter and 1/8 times as my current MAF 351 T5 with 3.73's

I'm confused - are you trying to make a case FOR gears or against it? From what you're saying above, you're claiming that the weaker motor with lower gears (numerically higher) performs near your 351W - this right there shows that the gearing helped dramatically in the 1/8 and 1/4. What was the speed density 5.0 putting out in terms of torque and horsepower? While the stock SO would die at the top end with 4.10's in the quarter, the gears are still a huge improvement over 2.73's.

Of course the 351 would have more torque out of the hole and be more difficult to keep traction and be harder to feed up top so 4.10's very well could be detrimental. Only half of this is true with the stock SO motor.
1988 Thunderbird Sport

gear/diff swap

Reply #21
Quote from: turbo_88_XR7;336638
4.10's will hook better than a numerically lower gear


I thought tires hooked...not gears? ;)

My bet is still on that the OP does NOT have 4.10's.

I'll eat my words if he shows proof of those gear being in fact what he says though.


He's also said a lot of other  that really doesn't make sense, that defies what is known as utter truth in our world of FoxCatBirds. (anyone remember his posts/threads about a SO pulling past 4k rpm? lol)

With that, I'm out...
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

gear/diff swap

Reply #22
Quote from: ThunderbirdSport302;336659
I thought tires hooked...not gears? ;)


Hah, yeah - that didn't make any sense to me either but I figured I'd just ignore it. Lower numerical gears would "hook better" if you just slam on the gas pedal as there's much less torque - higher numerical is just the opposite.
1988 Thunderbird Sport

gear/diff swap

Reply #23
What I'm saying is that too much gear can be a bad thing.

My old SD 5.0 was a stock HO with LT headers and exhaust.  From 2.73's to 3.73's in that car was worth just under 4 tenths.  That's not a HUGE difference.  In a car with less power and torque(because his SD computer is confused about the B-cam) it would be even less dramatic...his car is most likely pig fat rich at low rpm and goes crazy lean after 2500-3000.

Like I said before...you need the right gear for the combination....or at least make sure you're getting what you pay for!  lol

Hey, we don't all have to agree....it's the internet...we just have to try to be civil about it.  That's what seperates us, as an internet community, from other forums.

-Don
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

gear/diff swap

Reply #24
Quote from: Sick88Tbird;336663
What I'm saying is that too much gear can be a bad thing.

My old SD 5.0 was a stock HO with LT headers and exhaust.  From 2.73's to 3.73's in that car was worth just under 4 tenths.  That's not a HUGE difference.  In a car with less power and torque(because his SD computer is confused about the B-cam) it would be even less dramatic...his car is most likely pig fat rich at low rpm and goes crazy lean after 2500-3000.

Like I said before...you need the right gear for the combination....or at least make sure you're getting what you pay for!  lol

Hey, we don't all have to agree....it's the internet...we just have to try to be civil about it.  That's what seperates us, as an internet community, from other forums.

-Don


Ok, now I understand what you are saying, and I agree, like any modification ...the combination is critical .
Kinda like dumping a 1050cfm Holley  dominator on a completely stock  255 ci 81 Granada  wouldn't work out very well  .
 But I do stick by my stance that with absolutely no other modifications  gears will give you the best "bang for the buck" 0-60 :D
Fox-less at the moment

gear/diff swap

Reply #25
Quote from: Sick88Tbird;336663
What I'm saying is that too much gear can be a bad thing.

My old SD 5.0 was a stock HO with LT headers and exhaust.  From 2.73's to 3.73's in that car was worth just under 4 tenths.  That's not a HUGE difference.  In a car with less power and torque(because his SD computer is confused about the B-cam) it would be even less dramatic...his car is most likely pig fat rich at low rpm and goes crazy lean after 2500-3000.

Like I said before...you need the right gear for the combination....or at least make sure you're getting what you pay for!  lol

Hey, we don't all have to agree....it's the internet...we just have to try to be civil about it.  That's what seperates us, as an internet community, from other forums.

-Don


so, being civil means name calling, why would you refer me to a redneck when I'm BLACK!! not cool. No since arguing with the only person right on this topic. You win :bowdown:LOL your right about one thing bigger isn't always better, or are you, I never herd that term come from anyone that made any sense:punchballs:
1986 T-bird
347 stroker motor
185 AFR Heads
TrickFlow cam 224/232-542/563
Victor Jr. intake CNC ported
Quickfuel Holley 800 cfm
Hooker 1-3/4 long tubes
Custom built AOD
B&M 3000 stall
8.8 w/4.30 gears
UPR K-member,A-Arms,and coil-overs
UPR upper/lower control arms
Strange shocks/struts
26x10x15 M/T slicks
11.48@119.27
(coming soon Tremec 3550)
The Finished Product
http://s174.photobucket.com/albums/w92/03grinnie/T-bird/

gear/diff swap

Reply #26
Quote from: hypostang;336666
Ok, now I understand what you are saying, and I agree, like any modification ...the combination is critical .
Kinda like dumping a 1050cfm Holley  dominator on a completely stock  255 ci 81 Granada  wouldn't work out very well  .
 But I do stick by my stance that with absolutely no other modifications  gears will give you the best "bang for the buck" 0-60 :D


Within reason, yes, I'll bite.

Quote from: myself
My bet is still on that the OP does NOT have 4.10's.

What's that they say? Pics or GTFO...? :flip:
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

gear/diff swap

Reply #27
oh, I'm not really black :rollin::mullet:
1986 T-bird
347 stroker motor
185 AFR Heads
TrickFlow cam 224/232-542/563
Victor Jr. intake CNC ported
Quickfuel Holley 800 cfm
Hooker 1-3/4 long tubes
Custom built AOD
B&M 3000 stall
8.8 w/4.30 gears
UPR K-member,A-Arms,and coil-overs
UPR upper/lower control arms
Strange shocks/struts
26x10x15 M/T slicks
11.48@119.27
(coming soon Tremec 3550)
The Finished Product
http://s174.photobucket.com/albums/w92/03grinnie/T-bird/

gear/diff swap

Reply #28
Quote from: ThunderbirdSport302;336659
I thought tires hooked...not gears? ;)

alright, i failed at explaining lol.. ask any racer, not some guy crusing around on the streets.. 4.10's will hook the tires better than, say, 3.08's or something of that drastic difference

gear/diff swap

Reply #29
I know, I were teasin lol. I went from 2.73's to 3.55's...I know what a "kick in the ass" that was.

If DougyFresh had a set of 4.10's in after some higher gears...I doubt he'd have posted here askin' wtf it didn't have a bit more..."git up and go" lol
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)