Differential Cooler
Senior Member
Joined: Jun 2000
Posts: 998
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From: Tuscaloosa, AL
Car: 91Z, 91RS, '84 Jimmy
Engine: L98, 355, L98
Transmission: 700R, T56, 700R4
The only thing I know of is a large-capacity finned cover. The extra fluid will help reduce fluid heating and the fins will radiate heat out into the air.
TA's covers add about 1/2 pint of fluid capacity and are aluminum which means great heat dissipation.
In order to use anything else you'd have to come up with a means of circulating the fluid. Thermal convection probably won't be very effective with such thick fluid, and so little of it.
TA's covers add about 1/2 pint of fluid capacity and are aluminum which means great heat dissipation.
In order to use anything else you'd have to come up with a means of circulating the fluid. Thermal convection probably won't be very effective with such thick fluid, and so little of it.
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well ive seen 2 on cars.. one car that has one was in the new issue of GMHP..
i know they use a pump and heat exchanger mounted close.. i just have not yet seen an upclose picture.
the Viper board has a bunch of people with them but our rear ends are diff. also the BMW crowd are using them too. doesnt help me much because i need to see one done a GM rear.
i know they use a pump and heat exchanger mounted close.. i just have not yet seen an upclose picture.
the Viper board has a bunch of people with them but our rear ends are diff. also the BMW crowd are using them too. doesnt help me much because i need to see one done a GM rear.
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im going to enter in the silver state classic in sept.
i dont want the rear end heating up.
Nevada Desert + 90.3 mile course + 124mph sustained for long periods of time= not a very cool rear end.
im going to also install the T56 cooler from GM, it was made for the C5 but it fits.. im not going to buy their kit 835$, but mimic it with my own parts.
are there 2 holes on the rear end? i know there is the filler hole, but i need one on the bottom to take out the fluid, go through the heat exchanger and pump, then pump it back into the filler hole.
i dont want the rear end heating up.
Nevada Desert + 90.3 mile course + 124mph sustained for long periods of time= not a very cool rear end.
im going to also install the T56 cooler from GM, it was made for the C5 but it fits.. im not going to buy their kit 835$, but mimic it with my own parts.
are there 2 holes on the rear end? i know there is the filler hole, but i need one on the bottom to take out the fluid, go through the heat exchanger and pump, then pump it back into the filler hole.
Senior Member
Joined: Jun 2000
Posts: 998
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From: Tuscaloosa, AL
Car: 91Z, 91RS, '84 Jimmy
Engine: L98, 355, L98
Transmission: 700R, T56, 700R4
Stock there's just the fill hole, but as I recall the TA covers have a drain hole that would serve the purpose.
What's this about a T56 cooler? I've never heard of it. Got a link?
What's this about a T56 cooler? I've never heard of it. Got a link?
Senior Member
Joined: Jul 2004
Posts: 742
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From: Victorville, CA
Car: 85 Trans Am
Engine: 350 (CCC QJet)
Transmission: 700R4
Axle/Gears: 3.08 9 bolt
maybe use the one hole, both lines in on hole
have a tube at the lower part of the cover, almost on bottom of diff, sucks it through a hard line (stainless?) outside and returns in a stream towards pinion?
cant give you an example better than that (work)
have a tube at the lower part of the cover, almost on bottom of diff, sucks it through a hard line (stainless?) outside and returns in a stream towards pinion?
cant give you an example better than that (work)
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go to www.Gmpartsdirect.com
here is the part #12480080
i found a better place to get the pump.. its only 199$ the rest would be pretty easy to get.
you would use the fill hole on the tranny to put the fluid back in and the drain hole to suck it out, go through a tranny cooler and pump it back in.
same process for the rear end, looks like i'll have to get that TA cover and use the same process..
this should work with any T56 transmission
here is the part #12480080
i found a better place to get the pump.. its only 199$ the rest would be pretty easy to get.
you would use the fill hole on the tranny to put the fluid back in and the drain hole to suck it out, go through a tranny cooler and pump it back in.
same process for the rear end, looks like i'll have to get that TA cover and use the same process..
this should work with any T56 transmission
Supreme Member
Joined: Dec 2003
Posts: 2,391
Likes: 1
From: Newark, DE
Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00
NASCARs use rear differential coolers. They have a Ford 9", which is welll suited to the design. The pinion is actually broached on a NASCAR ring and pinion set to power the pump. I've also seen cars that had a pulley beyweent he yoke and the snout of the differential that ran to a small belt driven pump to circulate the fluid. Mark Williams has information on this in their catalog. I'd give them a call.
A T56 cooler should be fairly straight forward, as you said. Suck out the drain hole and discharge in the fill hole. They key will be having enough fluid int eh system to prevent suckign the trans dry. You'll also want to be sure that the system doesn't circulate so fast that the cooler doesn't have time to disipate any heat. I'd run temp senders in the supply and return lines to the cooler. Then hook them to a common gauge with a switch to toggle between senders. This will tell you how effective th coller is. You can vary pump output by adjusting the voltage. It would be fairly simple to set this up so you can do it in the car, which in motion too.
A T56 cooler should be fairly straight forward, as you said. Suck out the drain hole and discharge in the fill hole. They key will be having enough fluid int eh system to prevent suckign the trans dry. You'll also want to be sure that the system doesn't circulate so fast that the cooler doesn't have time to disipate any heat. I'd run temp senders in the supply and return lines to the cooler. Then hook them to a common gauge with a switch to toggle between senders. This will tell you how effective th coller is. You can vary pump output by adjusting the voltage. It would be fairly simple to set this up so you can do it in the car, which in motion too.
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I'd run temp senders in the supply and return lines to the cooler. Then hook them to a common gauge with a switch to toggle between senders. This will tell you how effective th coller is. You can vary pump output by adjusting the voltage. It would be fairly simple to set this up so you can do it in the car, which in motion too.
Supreme Member
Joined: Dec 2003
Posts: 2,391
Likes: 1
From: Newark, DE
Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00
Like that idea? I wish I could claim credit for it. I actually got it from an article in 4-wheeler some years ago. 4X4s have serious problems with heat an automatic transmissions. They run at such low speeds, and at such high RPM (steep gears for better crawl ratio) that there isn't much airflow over the trans or cooler, and the trans is working really hard. A lot of hard core rockcrawlers run electric cooling fans on their trans cooler, which is the size of a small radiator. That's what it takes to keep them alive. The dual senders allows you to see if the trans is too hot to begin with, and then measure the effectiveness of your cooler.
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