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Old 06-06-2011, 09:54 AM   #1
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Default 1995 bonneville transmission prob/perform

Yesterday my transmission went bad after my father drove it for two hours with no problems. Its slipping real bad pulling out, I can only move it in first gear not drive or overdrive. I have not looked deeper into it yet. But any ideas here?
possible switch to the 4t60ehd or 4t65hd?
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Old 06-06-2011, 11:26 AM   #2
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If you get no forward engagement in D or 3, but putting it in 2 or 1 give you a slipping engagement, that typically means your foward band broke. Only way to replace it is to disassembly most of the trans. Which suggests a rebuild or different transmission.
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Old 06-08-2011, 09:09 AM   #3
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So mainly you dont think it could be electrical or mechical solenoid problem? Also, the weird thing is that the VATS is.throwing a security light when trying to start the car, took about three tries.

And will the 4t60 hd bolt right up with no mods on the computer?

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Old 06-08-2011, 09:12 AM   #4
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And that is correct, but there is no engagement in od and d 2 and 1 the car engages with slippage, in d and od the engine revs to switch gears but no feeling of engagement
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Old 06-08-2011, 02:26 PM   #5
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The 4t60-hd doesn't have anything that'* drastically stronger. The diff is the same size and all the hard parts are the same. The differences, other than FDR, are in the valve body and accumulators.
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Old 06-08-2011, 10:59 PM   #6
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The problem is purely internal.
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Old 06-09-2011, 11:54 PM   #7
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Quote:
Originally Posted by billythekid View Post
And will the 4t60 hd bolt right up with no mods on the computer?
Correct.

There are two different types of PCM programmings: those that can control a 4T60E-family transmission, and those that can control a 4T65-family transmission. Therefore, being a 1995, your car should accept any 4T60-E or 4T60E-HD that fits and plugs in.

Bear in mind if you get one with a different gear ratio, you will need to re-tune, otherwise your shift points will be off by a couple hundred RPM.
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