M1009 Transmission Rebuild or Replacement ?

[Sverige]

My transmission is sticking between 1st and 2nd gear but does shift after increasing RPMs with a hard shift. I replaced the vacuum pump thinking that was the culprit but I was wrong. I suspect this may be a death sentence for the truck but I'm wondering if there is a cheaper alternative to spending $1800 on a transmission rebuild.

Any suggestions would be appreciated.

Thank you

 

[Recovry4x4]

You should follow the troubleshooting procedure in the tech manual. Vacuum is often the problem but there is much more Mmmto vacuum delivery than just swapping out a pump. Oh, by the way, if your tranny guy is going to pop you for $1800 to do a 400 turbo, shop for a new tranny guy.

 

[Warthog]

Bench price for a TH400 is about $400.

$1800 is on the high end. I just had a 4L60e redone for $1300. That was a removal, rebuild and reinstall.

 

[Skinny]

Buy a high pressure hydraulic gauge and do the proper checks as suggested. The TH400 is a big dumb transmission. If the governor or throttle pressures are spot on, you either have a sticky shift valve (easily fixable on the truck without too much experience), or clutch/brake issues (requiring full tear down, not to be done without knowledge). Either way the TH400 is pretty cheap to fix. I agree, that kind of money is rediculous. Time to shop around, go with recommendations an not on price point. A good rebuild is attention to detail and quality parts both of which cost money.

 

[Sverige]

Thanks, Gents. I sincerely appreciate the insight.

Skinny, how would clutch / brake issues cause the transmission I'm experiencing?

Thank you

 

[Sverige]

Update: Good news, gents. I had it diagnosed by a transmission shop and it only required a new vacuum pump regulator (and lines, which were dry rotted).

 

[nyoffroad]

Update: Good news, gents. I had it diagnosed by a transmission shop and it only required a new vacuum pump regulator (and lines, which were dry rotted).

Sure beats that $1800 rebuild!!!