| Time to replace/rebuild transmission? [message #209966] |
Wed, 05 June 2013 12:13  |
bjohnson
Messages: 5
Registered: May 2007
Location: Salt Lake City, Utah
Karma: 0
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Junior Member |
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This year (and last) my transmission started behaving badly; i.e. it doesn't always up-shift between 35-45mph, which usually only happens when hot--sometimes it's even slipped out of drive when going up-hill and took shifting (randomly) between N, D, S, and L to get it back in gear...
...it seems that these problems are more prominent when I'm pulling a trailer.
Is it time to replace/rebuild?
I'm in Salt Lake City, UT. Does anyone know of a reputable transmission repair shop/mechanic? Maybe even someone familiar with our GMCs?
Other thoughts/recommendations welcome. 
1978 23' GMC Ex-Birchaven
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| Re: [GMCnet] Time to replace/rebuild transmission? [message #209978 is a reply to message #209966] |
Wed, 05 June 2013 14:02  |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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Has less to do with a shop being reputable, the only parts a trans shop can buy for our transmissions is a gasket and clutch set, the rest of the parts must be reused or scavenged from old units. Manny has had the gone parts made, new chains, etc. You cannot buy a lower cost transmission anywhere plus considering all the parts he puts in it and the awesome converter he has made, he really is your only choice.
Is it the original transmission? Remember, this puppy is too big to push and a tow bill will dent the wallet. Fix big stuff on your time not out on the road broken down. Will cost you less and you will have a better finished product if you are proactive on this. Do you have a mechanic that's willing to give it a go?
Jim Bounds
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________________________________
From: Ben Johnson <ben@cdpd.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, June 5, 2013 1:13 PM
Subject: [GMCnet] Time to replace/rebuild transmission?
This year (and last) my transmission started behaving badly; i.e. it doesn't always up-shift between 35-45mph, which usually only happens when hot--sometimes it's even slipped out of drive when going up-hill and took shifting (randomly) between N, D, S, and L to get it back in gear...
...it seems that these problems are more prominent when I'm pulling a trailer.
Is it time to replace/rebuild?
I'm in Salt Lake City, UT. Does anyone know of a reputable transmission repair shop/mechanic? Maybe even someone familiar with our GMCs?
Other thoughts/recommendations welcome. :)
--
1978 23' GMC Ex-Birchaven
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| Re: Time to replace/rebuild transmission? [message #209998 is a reply to message #209966] |
Wed, 05 June 2013 17:42 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Check linkage adjustment and check/ replace vacuum lines to modulator and confirm fluid level correct. I know a restricted filter on TH 700R4 will cause pump whine and the above listed irregularities. Not sure if the 425 filter can get that restricted but worth looking into as well as check proper O ring filter neck tube fit.
John Lebetski
Woodstock, IL
77 Eleganza II
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