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T-5 in my 3600
#1225971 Tue Jul 18 2017 01:05 AM
Joined: Dec 2014
Posts: 375
S
Shop Shark
Hi All, So I'm trying to determine if a T-5 will work. My worries center around the driveshaft it being Sooo long.

Also Please help me understand " . . . you need to match the 5th gear to your rear differential gear or it may be a waste of time and money"

I find this on Lugnuts web sight 4.10 or 4.11 rear diff with a V8 T5 with a 0.63 overdrive Now I have a 4.10 differential. But it not listed under Straight 6s

Good gear combinations for an inline 6 engine
(listed in order of preference)
3.73 rear diff with 0.72, 0.73 or 0.76 overdrive
3.90 rear diff with 0.72, 0.73 or 0.76 overdrive
3.07 or 3.08 rear diff with 0.86 overdrive
3.42 rear diff with 0.76 or 0.86 overdrive
3.55 rear diff with 0.76 or 0.86 overdrive

Good gear combinations for a V8 engine
(listed in order of preference)
3.73 rear diff with 0.72, 0.73 or 0.76 overdrive
3.90 rear diff with 0.72, 0.73, 0.76 or 0.63 overdrive
4.10 or 4.11 rear diff with a V8 T5 with a 0.63 overdrive
3.07 or 3.08 rear diff with 0.86 overdrive
3.42 rear diff with 0.76 or 0.86 overdrive
3.55 rear diff with 0.76 or 0.86 overdrive

So is this possible?


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Re: T-5 in my 3600
SavannahDog #1225977 Tue Jul 18 2017 01:20 AM
Joined: Oct 2016
Posts: 685
N
Shop Shark
I put a T5 in my 3600 with a .72 overdrive.

I also changed out the rear axle for a better ratio. My single driveshaft that I had made was not too long, according to a very reputable driveshaft building company here in Norcal. Before I gave them the measurements, they told me that they would refuse to make me a driveshaft if it was too long. I believe it came in about 2.5 inches under the max. It also had to be a 4.0" diameter.

I chose a rear end with 3.73 gearing. I haven't driven it yet, but that was where the math took me with the 27" tire height that I wanted. A couple others here have 3600's who have done the same thing.

I see you have good taste in English cars too thumbs_up

Last edited by Norcal Dave; Tue Jul 18 2017 01:23 AM.

Dave

Clutch head screws have stolen too many hours from my life....

1950 Chevy 3600 (resto-something) - the work resumes...
https://goo.gl/photos/8t5mLuj4JZebvGq49

1963 GMC Widebed Custom

1951(?) GMC flatbed that is now a flower garden:
https://goo.gl/photos/H79pvKhHLxjNiR149

1968 Chevy II Nova- not running, waiting for me to finish the '50 3600
https://goo.gl/photos/Dh7q4pt3WSkKjjFr9
Re: T-5 in my 3600
SavannahDog #1226013 Tue Jul 18 2017 04:03 AM
Joined: Mar 2010
Posts: 9,223
5
Master Gabster
I have a T-5 with .72 5th gear behind a '53 235 with a 4.64 to 1 rear end gears, with 28" tires. I can pull a stump in first gear and drag it down the road at 65 MPH without even knowing that its back there (except for all of the honking and police sirens).
I would like to have 30" tires on it to raise my final speed up to 70 MPH, but .63 is not necessary in my opinion.
With your 4.10 gears and inline 6, you will be very pleased with the .72 rear gears. Those transmissions are much easier to find. Mine came out of an '85 S10 which has a 4 cylinder in it.

Re: T-5 in my 3600
52Carl #1226052 Tue Jul 18 2017 01:10 PM
Joined: Sep 2013
Posts: 1,020
M
Shop Shark
Dito 52Carl. My 51, 3600 has 4.10s with a .72 5th gear wct5. The driveshaft shop had no problems making a 4"dia 1 piece driveshaft.

The gear ratios work out great for my needs, on flat ground I run 5th, in the hills not so much but that's what the other 4 gears are for.

Good Luck,

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: T-5 in my 3600
SavannahDog #1226062 Tue Jul 18 2017 01:51 PM
Joined: Dec 2014
Posts: 375
S
Shop Shark
Great info Guy's but what does it mean and what are the Physics behind this "you need to match the 5th gear to your rear differential gear or it may be a waste of time and money"


I do Love British Sports Cars.


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Re: T-5 in my 3600
SavannahDog #1226065 Tue Jul 18 2017 02:01 PM
Joined: Jun 2006
Posts: 756
T
Shop Shark
its not really a physics issue it is a drivability issue. All it means is if you have a low rear gear (high numerically) you can pair it with more aggressive overdrive. in other words it doesn't make sense to start with "highway gears" and then pair it with an aggressive overdrive. most of those pairings arrive at a final drive ratio in the high 2.xx:1 range and that is the point.

Re: T-5 in my 3600
SavannahDog #1226069 Tue Jul 18 2017 02:35 PM
Joined: Dec 2014
Posts: 375
S
Shop Shark
Great, Thanks Tom!


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Re: T-5 in my 3600
SavannahDog #1226125 Tue Jul 18 2017 07:01 PM
Joined: Sep 2011
Posts: 1,961
L
Shop Shark
It's all about the math. Tire size matters. Most trucks with a T5 have a 28" or 29" diameter tire. Multiply the tranny gear X the rear gear. When choosing overdrive, getting the final number between 2.6 and 2.8 will make you smile the most. Having 1st gear X rear diff between 9 and 12 will make it feel good off the line without having to shift too quickly.

Only the V8 Camaro/Firebird T5s have the 0.63 overdrive. They also have a 2.95 first gear.
So your 4.10 rear combined with either a 3.75 or 4.03 first gear (found in T5s from V6 Camaros and S10 trucks) will make first gear seem like a granny gear. 4.10 X 3.75 = 15.375. Worse if the first gear is 4.03.
I will let you do the math for the V8 Camaro T5. It has 2.95 for 1st gear and 0.63 for 5th and is a close ratio tranny. Except the drop from 4th gear to 5th is a HUGE 37%.

Last edited by Lugnutz; Fri Jul 21 2017 06:32 PM.
Re: T-5 in my 3600
SavannahDog #1226143 Tue Jul 18 2017 08:35 PM
Joined: Dec 2014
Posts: 375
S
Shop Shark
Great, Thanks Lugnutz,

Now I can find what I want. Thanks SOoo much!! Now I understand!


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Re: T-5 in my 3600
SavannahDog #1226160 Tue Jul 18 2017 10:15 PM
Joined: Sep 2011
Posts: 1,961
L
Shop Shark
I think the 0.72 overdrive will work fine and you'd be happy. Moparguy has that comb and is happy. You would be too. First gear will feel very low.
I rebuilt a T5 for a guy with a 55 Chevy coupe. He lives in Ohio and it's flat there. We decided he'd be happy with a V8 Camaro T5 with the 2.95 first gear and the 0.63 overdrive. He had a mild 350ci engine. He loves it. He also has plenty of HP with the 350 to pull that 0.63 overdrive gear.
I mention this because before I shipped that T5 to him, I decided to give it a test run in my 1965 C10. My C10 has a stock 230ci and a 3.73 rear diff. I have a T5 from a 1983 V8 Camaro in my 65 but my T5 has the 0.72 overdrive gear. As I suspected, my inline 230 didn't like the 0.63 gear on hills. It would slow down and then start to lug the engine. Whereas my 0.72 overdrive gear does fine in the same situation. If you happen to find an early V8 Camaro T5 with a 0.72 overdrive, then grab it. It has all the gears you would want for excellent driving with your 4.10 diff.

Last edited by Lugnutz; Fri Jul 21 2017 06:36 PM.
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