Trany wont shift into od when driving

JOE1111111111

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1988 GMC C3500
0.5L
V8
RWD
AUTOMATIC
190,000 MILES

I have a 1988 gmc 3500 box van automatic, the trany works great exept when I get to 50mph or even 55 mph trany wont shift to a higher gear, the rpms scream at 50mph speed sensor?

Wednesday, February 10th, 2016 AT 7:52 PM

2 Replies

HMAC300

MECHANIC
48,601 POSTS

No it may be a valve hung up or and adjustment along with an internal problem. Have a trans guy look at it.

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