01-18-2023, 04:32 PM | #1 |
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Join Date: Oct 2014
Location: Bay Area, CA
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700r4 problems
I have a 1983 Blazer with a 6.2 diesel and 700r4. When taking off from a stop, the transmission starts out in 2nd instead of 1st. It will only start in 1st gear if I manually shift it into 1st. It seems to only do this after the trans warms up a little bit. Otherwise, everything else seems to work normally. The shifts feel good, no slipping, and the fluid is clean and full (checked when running and warm.) It downshifts if I step on the accelerator when climbing a grade or trying to pass someone. The problem is only when coming up to a stop and trying to take off.
Any thoughts what this might be? |
01-18-2023, 10:26 PM | #2 |
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Join Date: Mar 2003
Location: Colfax-California
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Re: 700r4 problems
How well does reverse work?
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01-18-2023, 11:42 PM | #3 | |
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Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: 700r4 problems
Check the adjustment and operation of the TV cable.
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01-19-2023, 12:00 AM | #4 |
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Join Date: Mar 2015
Location: washington
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Re: 700r4 problems
There is a one way sprag, Input Forward Sprag , its part of the input shaft has failed.
Cheers. Maybe the wrong signature in this case! |
01-19-2023, 12:24 AM | #5 |
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Join Date: Apr 2005
Location: BC, Canada
Posts: 122
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Re: 700r4 problems
there's actually 2 sprags and the one that is the issue is in bottom geartrain, not the input drum. this is the lo roller clutch. when you pull the lever into manual low the low/reverse clutch pack engages and is why you are getting forward movement. this clutch pack is only engaged when lever is in manual low. time for teardown
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01-19-2023, 03:45 AM | #6 |
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Join Date: Oct 2014
Location: Bay Area, CA
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Re: 700r4 problems
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01-19-2023, 03:46 AM | #7 |
Senior Member
Join Date: Oct 2014
Location: Bay Area, CA
Posts: 340
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Re: 700r4 problems
Thanks for the replies. I've heard it could be the governor sticking. Does that seem plausible?
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01-21-2023, 02:28 PM | #8 |
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Join Date: Apr 2005
Location: BC, Canada
Posts: 122
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Re: 700r4 problems
no
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01-23-2023, 08:31 PM | #9 |
Senior Member
Join Date: Oct 2014
Location: Bay Area, CA
Posts: 340
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Re: 700r4 problems
Well, I inspected the governor and found that the valve was stuck. Cleaned it up and made it move freely, changed the fluid and filter and it seems to be shifting great now. Drops down into 1st normally, and actually shifts a bit smoother. Not counting my chickens just yet since I've only put about 40 miles on it since tinkering with it, but I'd say it's fixed. Thanks for all the replies.
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