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Old 10-24-2021, 08:20 PM
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68lemans462 68lemans462 is offline
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Join Date: Jul 2003
Location: Lakewood, Colorado
Posts: 1,418
Default Transfer case or transmission problem?!

I have an '06 Yukon with 137k miles on it. The 4l60e started slipping and it was rebuilt about 4k miles ago. Has worked flawlessly so far. The truck has always had a mild "clunk" when shifting under a light load. Today while driving I hear a "clunk" similar to the usual clunk but louder and the truck acts like its in neutral when in any gear. The truck WILL lock the wheels in park. At first the truck didnt want to shift in and out of 4wd, but it seems to go from 2h/4h/4l ok at this time. No 4x4 errors or codes.. I'm trying to determine if the transfer case has failed or the transmission. What else should I try?

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1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude

Last edited by 68lemans462; 10-24-2021 at 08:25 PM.
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