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Old 09-13-2020, 04:18 PM   #1
BeaverMeat
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Default V8 final drive ratio

What final ratio are you guys using with V8 swaps?

Right now my 5.0/T-5 has 3.73s and I find first gear way too short for my liking. It has to do with the '89 Mustang T-5 ratios that are meant for the 3.08 final gears.

I'm wanting to go with a 3.31.
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Old 09-13-2020, 04:45 PM   #2
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I owned a 1988 744 with a Converse conversion and T5 transmission for about three years. Originally the car had a 3.73 ratio open rear end. I installed a 1041 3.31 ratio complete rear axle from a 1992-94 965. I was very pleased with the ratio and the limited slip.
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Old 09-13-2020, 05:18 PM   #3
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Good to know.

Finding a 1030 3.31 axel or gear set will be a bit tough to find in Canada. I guess if I’m going with a Detroit TruTrac I might as well source a 3.31 gear set and be prepared to pay.
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Old 09-13-2020, 05:19 PM   #4
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Depends what you’re doing.
Just a cruiser? 3.31 would be a good choice.
I have 3.73 in the drift car, and will be trying out a 3.31 here in a bit.
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Old 09-13-2020, 06:28 PM   #5
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I won’t be drifting it. It’s actually a daily driver. A sedan with a V8 is my idea of a practical family car.
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Old 09-13-2020, 10:11 PM   #6
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I will say, highway driving with the 3.73 rear end is pretty annoying. Blowing the tires off at 50-60 is fun though .
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Old 09-13-2020, 10:36 PM   #7
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Quote:
Originally Posted by culberro View Post
I will say, highway driving with the 3.73 rear end is pretty annoying. Blowing the tires off at 50-60 is fun though .
Right now it revs around 2000rpm down the highway going 63mph/100km/h... that’s with oversized 205/65r16 tires and a .68 O/D.

Even if I swap to a 3.31 and shrink the tires down to the proper size it will be reving at 1900. I would like it closer to 1500-1700 but I guess you can’t have it all.
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Old 09-13-2020, 10:44 PM   #8
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I am doing a 3:89 with a TKO600 trans
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Old 09-14-2020, 12:02 AM   #9
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Quote:
Originally Posted by 2turbotoys View Post
I am doing a 3:89 with a TKO600 trans
The TKO600 has a WAY better gear set with a 2.87:1 first gear which is better suited to short final ratios.

The '89 Mustang T-5 is a 3.35 first gear.

Last edited by BeaverMeat; 09-14-2020 at 12:08 AM..
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Old 09-14-2020, 11:17 AM   #10
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I run a 3.73 behind my TH700 r4 and SBC. I turn 2500 at 70, I would prefer a 3.31 and my next rear end will be that
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Old 09-14-2020, 11:25 AM   #11
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I'm using a CD009 style Nissan trans on mine (alu 5.3 with a turbo). And those ratios are rather short for a 6 speed:
1st: 3.79
2nd: 2.32
3rd: 1.62
4th: 1.27
5h: 1.00
6th: 0.79
370Z MT rear axle:3.69

So far, as a 'temporary' standing (it's been that way for a year so far, lol) I'm still using my 245's original 3.73 rear axle. Which is actually pretty close to what Nissan uses with the same trans. But... it's pretty ridiculously short, especially for a motor chock full of torque like the 5.3 Ellis.

I have a narrowed Ford 8,8 that I'll put in at some point, I just need to ponder the gear ratio. It will def. go taller. Low 3's.

Spinning the driveshaft slower at higher speeds is a pretty good thing, not much downside.
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Old 09-14-2020, 12:15 PM   #12
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3.31 for me. 960's have em
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Old 09-14-2020, 12:48 PM   #13
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I’m so thankful for this thread. I have been suffering with the factory 3.91 and wondering where to go next.
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Old 09-14-2020, 12:51 PM   #14
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3.73 with a T56-0.5 6th. I could probably go 3.90 or 4.11. My car does 1500 rpm at 70
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Old 09-14-2020, 12:57 PM   #15
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Yeah that t56 0.5 is amazing. I’ve been holding out for one.
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Old 09-14-2020, 01:37 PM   #16
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What is the diameter of your tires? OK, 205/65R-15 tires = 25.49"
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Old 09-14-2020, 01:48 PM   #17
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Here's a nice gear ratio/car speed calculator: https://www.tremec.com/calculadora.php

I'm thinking a 3.08 will work pretty well in my Ford 8.8. The taller the rear axle ratio, the slower the driveshaft turns, which is a good thing if you ever get the car up to high speeds. Just look at what happened under propav8r's donor car. As long as the transmission is suitably geared lower.

Last edited by JohnMc; 09-14-2020 at 03:01 PM..
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Old 09-14-2020, 02:56 PM   #18
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Quote:
Originally Posted by lummert View Post
What is the diameter of your tires? OK, 205/65R-15 tires = 25.49"
205/65r16

26.5"!

Way too tall for me. Looking to step it down to a 205/50r16 or 205/55r16... 225/50r16 would be the cat's-ass but I'll have to check if they'll fit. The ASA AS-1s that are on it now are 16x7 ET18 (haven't been able to see an other set like them online)

Last edited by BeaverMeat; 09-14-2020 at 03:02 PM..
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Old 09-14-2020, 03:54 PM   #19
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The 225/50R16 will fit without issue, same size I'm running on a similar wheel.
You will want a 3.31 with that diameter of tire.
What 5th gear ratio does your T5 have?
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Old 09-14-2020, 05:33 PM   #20
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The rare-bear 3.15 '83 3-speed auto 760TD if it's a 6.0 alum LS with most of the trans available with ~.80 OD & stock diameter tires for a street car?.

But probably 3.31s oftentimes from manual EFI 83+ 240s / 92-94 solid axle 965s for you 7/9 solid axle guys of stuff that's cheap/commonly junkyard available?
N/A manual 4-cyl 700s have 3.31s as well, though 92-94 960 are a lot more common...anymore.

3.31s pretty common, 3.15 very rare, 3.54s somewhat rare (manual Diesels, 700 Turbo), some canadian GLT w/B23E/3-speed autotragic if they haven't all been crushed/rusted out/canadian wreckers don't want a million dollars for any one single part/full service only or drive foooorever to a self-serve junkyard where those cars probably aren't (Kelowna or Kamloops?)/all gone by now.
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Old 09-14-2020, 05:56 PM   #21
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Quote:
Originally Posted by culberro View Post
The 225/50R16 will fit without issue, same size I'm running on a similar wheel.
You will want a 3.31 with that diameter of tire.
What 5th gear ratio does your T5 have?
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Quote:
Originally Posted by Kjets On a Plane View Post
The rare-bear 3.15 '83 3-speed auto 760TD if it's a 6.0 alum LS with most of the trans available with ~.80 OD & stock diameter tires for a street car?.

But probably 3.31s oftentimes from manual EFI 83+ 240s / 92-94 solid axle 965s for you 7/9 solid axle guys of stuff that's cheap/commonly junkyard available?
N/A manual 4-cyl 700s have 3.31s as well, though 92-94 960 are a lot more common...anymore.

3.31s pretty common, 3.15 very rare, 3.54s somewhat rare (manual Diesels, 700 Turbo), some canadian GLT w/B23E/3-speed autotragic if they haven't all been crushed/rusted out/canadian wreckers don't want a million dollars for any one single part/full service only or drive foooorever to a self-serve junkyard where those cars probably aren't (Kelowna or Kamloops?)/all gone by now.
I’d go with a 3.15, like you said if I can find one.

Last I checked the local guy Volvo speciality guy wants $60 CAD for an axel. lol.

I wasn’t too sure the 7 series axels would fit the 2 series.
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Old 09-14-2020, 06:02 PM   #22
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Chances of finding a 3.15 gear set is nearly zero. 3.31 will work fine for you. The small block Ford engine is not a low rpm torque monster like the LSX Chevrolet engine is. My LS1 with T56 pulls along at 1500 rpm no problem. Those Ford small blocks like running closer to 2,000 rpm cruising.
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Old 09-14-2020, 06:02 PM   #23
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They don't. Wider, and not the right suspension mounts.
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Old 09-14-2020, 06:05 PM   #24
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Start with a 200/75 164 1031 axle or have the tools/time to change the gears, your choice.

7/9 axles no fit 200, correct.
Odds of finding 3.15 gear set basically zero. Seen 1 in the last 10-20 years walking past 10,000+ volvos.

3.31:1 probably just fine, especially for the SBF.
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Old 09-14-2020, 06:43 PM   #25
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Quote:
Originally Posted by 740atl View Post
I’m so thankful for this thread. I have been suffering with the factory 3.91 and wondering where to go next.
I'm heading to Port Norris and Cape May, returning on the ferry this weekend, I'll look for a gearset tomorrow. All I have loose is 3.55 (1030), 3.73, 4.10 (1031). But I have some rears, I'll count toofs.
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