I get different answers all the time. What year did the 4t60e change to the 4t65e? What class of bonnie, got the trannie. Some have said 96, others 98, it all differs depending on the website you go to. Anyone have definite info?

You have the 65. 97 was the first year. You can get shift kits.

If in doubt, read the numbers on the bottom of the transmission pan. It'll say 4T65E Hydramatic.

There are also shift modulators available that may give you the same effect you're after for less money.

I think intenses shift kits are only for the HD version of the drivetrain.

On the zzp page, it says that they are only for the 4t65e, HD or not.

Next step would be to contact Zoomer or Scott. Let us know what you find out. I believe the shift kits may actually be for both, but the LSD'* are obviously not interchangeable.

Actually guys, a good Tranny guy CAN BUILD YOU a Custom Kit too! I had one built into my 4T60E on my 87 LeSabre! It'* just a matter of changing spring tensions & the location of the detent balls. The skill comes from changing it from stock to the new set up!