LB7: Delay moving after sitting for a week

CoyoteHunter67

New member
Mar 5, 2016
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If it sits for a week or so there is a delay before moving in reverse or forward. once it gets going runs and shifts fine. think it could be the seals around the pump shaft? If is, what kind of job would it be to replace them.
 

Burn Down

Hotrodder
Sep 14, 2008
7,092
28
48
Boise Idaho
What year is the truck?

Early 5 speeds had a converter drain back valve issue IIRC. Pretty sure the trans has to be pulled to fix it.
 

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,681
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63
Fullerton CA
The plastic sealing rings are defective from the factory. There could also be ware grooves in the front drum.
 

CoyoteHunter67

New member
Mar 5, 2016
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if it is the sealing rings. does the trans have to be pulled to fix it. would the rings be the place to start.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,752
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Phoenix Az
if it is the sealing rings. does the trans have to be pulled to fix it. would the rings be the place to start.


Yup. Not worth pulling imho if the Trans works fine otherwise. Just let it idle a little longer at first start up and take it easy on the throttle till she starts moving like it should. I've been told it won't hurt a thing (had this issue before)
 

jdlover1

437 Cubic Inches
Oct 4, 2006
538
0
16
chapanoke,nc
Both of mine does the same thing. Just put it N for a few seconds and away it goes. Use to run a self propel sprayer with a Allison 3 speed with overdrive in it and it would do the same thing put it in N for a few seconds and away it goes. I just figured it was nature of the beast