When warmed up and I shift my 86 D-100 225/A-904 into drive there is a loud "thunk" as the transmission engages that makes the entire truck shudder. This does not happen for reverse or when the tranny is not warmed up. Any idea where to look for the cause/fix?

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Thanks,
Tad

86 D-100 "The Raccoon"

How long since the last band adjustment?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

No clue... Bought it about a year ago and am getting acquainted with her. what does that entail?

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Thanks,
Tad

86 D-100 "The Raccoon"

Would not be a band adjustment problem. No bands are applied in drive/breakaway. First/reverse band is applied in manual low. First/reverse band is applied in reverse. Intermediate band is applied in second gear. No bands applied in high gear.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Does it do this while on fast idle?

But why not in reverse? Hmmm. Valve body issue maybe. Sticky valve or misajusted shift linkage perhaps.

CJ

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Part of Tyrde-Browne Racing

How high is the idle speed, whn it "bangs" into gear?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Excessive end play in the clutch packs.

Make sure it is not slack in the u-joints or diff first.

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Official Cookie and Mater Tormentor.

I am adding a Tach to see how fast it is idling. I am having choke issues and it does idle very fast.

How do I check to see if it the rear-end?

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Thanks,
Tad

86 D-100 "The Raccoon"

With the truck in neutral and the wheels blocked so it won't roll over you, crawl under it and turn the driveshaft back and forth by hand. If you can turn it more than 1/4 turn or so you have rear/u-joint issues.

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Official Cookie and Mater Tormentor.