Our new to us Hummer W/Duramax,Alison Trans. troubles,HELP - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 32 (permalink) Old 01-02-2009, 10:33 PM Thread Starter
 
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Our new to us Hummer W/Duramax,Alison Trans. troubles,HELP

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Only owned it for three weeks. Just had Predator motorsports (who did the conversion) completely go through the whole vechical, and change all fluids etc. When I drove it home I noticed that the transmission temp.s were running much higher than "normal" About 240-250 deg. When I told the owner of predator about it he said that was pretty much normal. then today while driving 70 on flat terrain. I got the "Hot transmission" message and the temps were close to 300Deg. I stopped and I had trans mission fluid dripping from the front end of the trans. pan. I checked the level while in park at idle and it was like five inches above the hatched area marked hot. We made it home by driving 55 and it stayed hot but not over 240 at that speed...... next day I let it warm up to normal temps and checked trans fluid level and it's two inches above ful hot hatch marks. Temp. stayed @ 160 untill I climbed some hills then got up to 225. Have I damaged it by driving 250 miles while over full? Why is it leaking? is it coming out the vents

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post #2 of 32 (permalink) Old 01-02-2009, 11:04 PM
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my opinion too much oil might make it a little warmer, i would think a mechanical problem creating heat.

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post #3 of 32 (permalink) Old 01-02-2009, 11:11 PM Thread Starter
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my opinion too much oil might make it a little warmer, i would think a mechanical problem creating heat.
Well it got VERY warm, like 290. A mechanical problem like sliping? cause there was an Edge box on it an the prev. owner might have hot rodded it on a high power setting?
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post #4 of 32 (permalink) Old 01-03-2009, 04:01 AM
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Only owned it for three weeks. Just had Predator motorsports (who did the conversion) completely go through the whole vechical, and change all fluids etc. When I drove it home I noticed that the transmission temp.s were running much higher than "normal" About 240-250 deg. When I told the owner of predator about it he said that was pretty much normal. then today while driving 70 on flat terrain. I got the "Hot transmission" message and the temps were close to 300Deg. I stopped and I had trans mission fluid dripping from the front end of the trans. pan. I checked the level while in park at idle and it was like five inches above the hatched area marked hot. We made it home by driving 55 and it stayed hot but not over 240 at that speed...... next day I let it warm up to normal temps and checked trans fluid level and it's two inches above ful hot hatch marks. Temp. stayed @ 160 untill I climbed some hills then got up to 225. Have I damaged it by driving 250 miles while over full? Why is it leaking? is it coming out the vents
If it's only leaking out of the pan gasket you are alright (as far as leaks are concerned). If you know it's overfull like that and you don't have shop to work in. Take the filter off, dump out and put back on (repeat until you got the proper level). Overfilling a transmission will make it overheat.

I would get it serviced. Check it out. Make sure nothing is laying in the pan.


FYI, I don't know how easy those are to service. The Hummers I've been underneath have all had brush guards underneath it, might make it a pain in the butt to service. Something to check out.
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post #5 of 32 (permalink) Old 01-03-2009, 04:06 PM Thread Starter
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If it's only leaking out of the pan gasket you are alright (as far as leaks are concerned). If you know it's overfull like that and you don't have shop to work in. Take the filter off, dump out and put back on (repeat until you got the proper level). Overfilling a transmission will make it overheat.

I would get it serviced. Check it out. Make sure nothing is laying in the pan.


FYI, I don't know how easy those are to service. The Hummers I've been underneath have all had brush guards underneath it, might make it a pain in the butt to service. Something to check out.
I can get to a drain bolt in the trasns. pan. What would be laying in the pan?
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post #6 of 32 (permalink) Old 01-03-2009, 05:04 PM
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Quote:
Originally Posted by DZLROKET View Post
Well it got VERY warm, like 290. A mechanical problem like sliping? cause there was an Edge box on it an the prev. owner might have hot rodded it on a high power setting?
If the trany was sound before the Predator I would try Synthetics they are more heat tolerant. How many miles on it? You did not say what fluids you used I would use Amsoil of course.
Hummers are not cheep why not go for the best.

The Live Nation Motor Sports Grave Digger had the same issue hot trannys Amsoil solved there over heating totaly.
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Last edited by CrowsSynthetics; 01-03-2009 at 05:06 PM. Reason: added info
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post #7 of 32 (permalink) Old 01-03-2009, 05:18 PM Thread Starter
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If the trany was sound before the Predator I would try Synthetics they are more heat tolerant. How many miles on it? You did not say what fluids you used I would use Amsoil of course.
Hummers are not cheep why not go for the best.

The Live Nation Motor Sports Grave Digger had the same issue hot trannys Amsoil solved there over heating totaly.
Bill
Trans. has 9k miles on it. yes it was sound. yes we went with all synthetics. I run Amsoil in my dodge.
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post #8 of 32 (permalink) Old 01-03-2009, 05:20 PM
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I can get to a drain bolt in the trasns. pan. What would be laying in the pan?
Hopefully...nothing. But if you service it and find something laying in the bottom in the pan, (any transmission). If you find parts laying in the bottom of the pan it's good indicator something is seriously wrong and the transmission will need to come out. Allison's are tough as nails though, they can take tons of abuse.
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post #9 of 32 (permalink) Old 01-03-2009, 05:37 PM
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Quote:
Originally Posted by DZLROKET View Post
Trans. has 9k miles on it. yes it was sound. yes we went with all synthetics. I run Amsoil in my dodge.
I do know The GD transmission fluid was boiling out of the tranny and input shaft was failing, Coan is the tranny builder and they strongly suggested Amsoil as a solution.
Good luck
Bill


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post #10 of 32 (permalink) Old 01-03-2009, 08:16 PM
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I do know The GD transmission fluid was boiling out of the tranny and input shaft was failing, Coan is the tranny builder and they strongly suggested Amsoil as a solution.
Good luck
Bill
I've never heard of someone adding amsoil to fix trany problems. But starting off a new transmission with Amsoil works amazing.
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