My tranny's shifting points seem to vary wildly.

[Knightmare]

I was driving my old girl around town today, and the shifting seemed a little funny to me. Granted this is only the 4th day I've had her out on the town, I had some small issues with her that I got sorted out, so I don't have a ton of experience with these things.

While she was cold, or semi cold even, I got nice firm shifts, 1 at ~25, the next at 40-45. After we had been driving for 15 minutes or so, the shifts became less firm, and it stays in second for shorter periods of time. I even caught the truck shifting out of 2nd after one second, effectively skipping it.

My tranny fluid looks fine, but doesn't smell that good, it smells burnt.

I understand the trans should shift differently when under different load, but while cold, it doesn't want to shift early, and when warm, I can't stop it from shifting early. My input doesn't seem to matter much.

Am I just being paranoid? Does this sound normal? Or maybe the early symptoms of a tranny rebuild?

 

[1986Blazerk5]

Did you replace the vacuum lines?

 

[Knightmare]

Not yet, it's on my list of things to do to this truck. I'm guessing they can have an effect?

 

[1986Blazerk5]

Not yet, it's on my list of things to do to this truck. I'm guessing they can have an effect?

I don't know alot about transmission's but i would start there, then change oil and filter

 

[doghead]

Change your vacuum hoses first. test your vacuum pump second(replace if bad). try adjusting your vacuum valve third(replace if bad). Replace your vacuum modulator, last.

All of the proper test procedures for shifting issues, are listed in the TMs.

If that don't fix ya, you may have a bad Governor or a serious internal issue.

You have downloaded and saved all the Tech Manuals for the CUCV, right?


fwiw, I have new vacuum valves for sale in the classifieds. CUCV Vacuum Valves