My transmission has a extra shift which makes it a five speed auto and it only happens at less than part throttle speed from a stop sign. Can someone explain this problem its kind of affecting the accelerating of my car.

 

Hi, I've been expericencing this same symptom for a while now and I've taken my car back to the place rebuilt it about 1 1/2 yr ago and he saids theres nothing wrong that their is an extra shift but I think he's giving me the run around.

 

There are no GM 5 speed automatics. What you're feeling is the torque converter locking up at part throttle. When this happens the RPMs drop, kinda like a shift into another gear.

 

Yeah, it's the torque convertor locking up. Depending on how I drive my car, it is a really firm engagement like another gear.

For the record, GM does make a 5-speed auto, they just don't put it in any of their own cars. I think it goes in a BMW or something like that. For the trivial minded, check out www.gmpowertrain.com
Some neat stuff there!
Look at the 4L60E. I was amazed at their rating for it!
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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand. (Man, those Fast-Burn heads look good, (just sitting there doing nothing!LOL))

Starting to look like the Kicker poster child!

ASE Certified Master Tech

[This message has been edited by JP84Z430HP (edited June 05, 2001).]