Clarification about Bonneville transmissions - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-14-2004, 08:36 PM   #1
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Default Clarification about Bonneville transmissions

I was looking at the Techinfo article about the tranny specs, and it confused me. What exactly is the weak part of our driveline? How much torque from the engine can the 4T60e and 4T65e handle? Are the transmission internals the weak spots, or could I throw a different torque converter on and mod the motor like crazy? Please spell it out for me so there'* no confusion. Thanks a lot!
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Old 12-14-2004, 09:25 PM   #2
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If you do a search, there should be tons of answers for you, and even ones you didnt think of. But I think the basic tranny of a series 2 can handle up to 230-240 hp decently. Dont know about torque.
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Old 12-14-2004, 10:38 PM   #3
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Very true. For a long time I thought I was pushing the limits of my tranny, but based on this I'm probably fine. I didn't know if I was putting it in danger by getting an Intense PCM. The last thing I need is a ruined tranny. I'm still thinking I'll definitely put a cooler on it; I've needed one for a while.
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Old 12-15-2004, 02:17 PM   #4
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Ok. lol..... you almost confused me more! I'm glad you caught that. You had me thinking the 4T60-E could handle those kinds of numbers!

So what'* a guy like me supposed to do after some engine modding? Install a tranny cooler and hope for the best? If and when my tranny goes out, what options do I have for replacement units that have higher tolerances, i.e. will a 4T60E HD or a 4T65E HD bolt right up to my motor? I know this topic has already been discussed (I may have even asked this question before), but I'd like someone to spell it out plainly for me. Should I look into a performance rebuild kit? What'* the best bang for buck in tranny options?
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Old 12-15-2004, 02:46 PM   #5
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quick note:

you'll never find a tranny from gm that is *offically* rated for more torque than any engine that is currently put behind it.

think about that one for a minute.

if we had a tranny that could take 500 ft-lb of torque on the input, but we only put it behind an LS2 @400 ft-lb, you would see a maximum rating of 400 ft-lb, and only a few people would really know what the tranny could take. well, more than a few, but not a lot...

just some food for thought.
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Old 12-15-2004, 03:04 PM   #6
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I understand the concept you're explaining, but I don't understand the reasoning behind it. Why would they do that? Am I missing something?
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Old 12-15-2004, 03:30 PM   #7
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all I know is its definitaly a weak spot.....lots of members here in the new tranny/blown tranny club. Long story short if you cant afford the consequenses then dont do the modding.......on that note my new 4T60E has a 36000 mile warranty and the svc. manager at the dealer said he would still honor it even with my mods, its a good thing hes an old friend LOL.
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Old 12-15-2004, 03:43 PM   #8
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thats great but who the heck is Rick?
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Old 12-15-2004, 03:48 PM   #9
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sahrriitte
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Old 12-15-2004, 03:49 PM   #10
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Jr's3800: You keep saying "Abuse, abuse, abuse" but what do you define as abuse? Neutral bombing? <--- I would hope you don't do that. WOT at lights? I'm just curious whatcha think is abuse.


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