| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
07-04-2013, 03:18 PM
|
|||
|
|||
hard shifting turbo 400
I have a mildly built 400 with a t-400 behind it with 3.23 gears in a 69 vert. Since building, I have about 2000 miles on the car and it always ran well. This morning, it started shifting hard and the shift points (both 1-2 and 2-3) seemed to happen at a higher RPM than before. What I find strange is that I have changed nothing on the car to cause this. Everything was rebuilt 2000 miles ago at the same time, new torque converter supplied by the tranny builder (stock converter, not sure of the brand but the brand he routinely uses) new modulator, and internals, etc. Car was built as a cruiser and I have never even spun the tires. Any ideas what to look for?
|
|
#2
07-04-2013, 04:39 PM
|
||||
|
||||
|
Check your vacuum at the source and at the modulator with a gauge. It sounds like a vacuum leak or a related external issue.
__________________
The difference between inlaws and outlaws? Outlaws are wanted |
|
#3
07-04-2013, 05:45 PM
|
||||
|
||||
|
I am with Stevep
My GMC 85 1-ton Dually just did the same thing a month ago
that was my issue the hose at the modulator had sofened up from exhaust heat and wasnt sealing well on the modulator.. I sense an easy fix Scott |
|
#4
07-05-2013, 07:43 AM
|
||||
|
||||
|
Ditto, little or no vacumm to the modulator, or the modulator has gone south.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#5
07-05-2013, 11:39 AM
|
||||
|
||||
|
Quote:
 Karl 
|
|
#6
07-05-2013, 12:52 PM
|
|||
|
|||
|
and I have never even spun the tires
Yea right, are you sure?
__________________
'68 GTO '69 Corvette '75 Cadillac Coupe Deville TOM |
|
#7
07-05-2013, 04:33 PM
|
|||
|
|||
|
hey
Quote:
|
|
#8
07-05-2013, 04:34 PM
|
|||
|
|||
|
hey
Quote:
BTW, it was a vacuum leak. Thanks to all who replied for the help. |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
