2-SPD AUTOMATIC WON'T UPSHIFT.

All Other Makes

Tiny

harrydunn

September, 15, 2006 AT 11:48 PM

1968 Cutlass with 8,000 miles on the 2-spd automatic rebuild from a reputable trans. Shop. Will not shift into second automatically but if I pull it down to first manually and then take to second manually it will shift everytime perfectly. It also downshifts back to first at stops signs just fine. I found that the vacuum modulator tube was sheered in half and that this surely is the cause. Replaced with new tube and same result. Is it possible I'm not getting vacuum to the modulator for another reason upstream or do I need to look elsewhere? The vacuum line feeds off of the carb.

Thanks.

--Mark

FOUND 2148 RELATED QUESTIONS

Trans Not Shifting

39 ANSWERS
3 IMAGES

Not Shifting

28 ANSWERS
1 IMAGE

0 Answers

Please login or register to post a reply.

 Step by Step video GMC Yukon XL 2000-2006
Code Read Retrieval/Clear Mercedes-Benz C230
Code Read Retrieval/Clear Scion XD
Code Read Retrieval/Clear Mercedes Benz