Transmission Cunk - Normal?

My 1994 Yukon had it's original 4l60e transmission rebuilt roughly 2 years ago with high stall convertor and a shift kit. Currently has 15k on the rebuild. I'm unaware of the specifics as it was redone by the previous owner. All I have is the shop ticket which is unfortunately unspecific.

I've found that when rolling to a stop, I'll often get a little "clunk" as the truck shifts down from 2nd into 1st. Not everytime, but sometimes, especially if I'm coming to a sudden stop.

I don't get noise when shifting up.

The 12 bolt rear end is original and has a tiny bit of play, as is normal for the age. Just had the fluid replaced and was resealed. Not abused, just used. All u-joints are new and I just greased them ~1 month ago.

Is this normal for a transmission equipped with a shift kit?

Craig said:

The 12 bolt rear end is original and has a tiny bit of play, as is normal for the age.

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GM never put a 12 bolt in these. Should be a 10 or 14 bolt.

And no, what you're describing doesn't sound normal.

df2x4 said:

GM never put a 12 bolt in these. Should be a 10 or 14 bolt.

And no, what you're describing doesn't sound normal.

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Oops. It is a 10 bolt.

I ask because I've been getting mixed information. Told by some that it's a normal byproduct of the momentary torque reversal and others that it's unusual or a sign of wear elsewhere.

I had my last 4L60E built up substantially (before I blew it up just like the original) with billet servos, TransGo HD2, S10 converter, beast sunshell, etc. I never felt anything like what you're describing.

Could very well be rear end. Are you positive it's the trans?

Slip yoke?


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I'm not sure if its normal or not, but we had an 85 suburban with the 700r4 and it would do that when the transmission was left in D instead of OD. Nothing ever came of it though.