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Im having trouble shifting the R151F tranny when its cold.

when drive the truck when its cold it is almost impossible to shift it into 2nd... all other gears work fine but for some reason 2nd will not shift into gear until tranny worms up? anybody having this problem?

Hope Marlin pitches in with some advise:D
 

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Try some Redline MT-90 gear oil in it.

That should help, but eventually you're probably going to need a rebuild...
 

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Synchros get worn over time, and as the bearings wear, the shafts get more play and the clutches don't like to engage as smoothly/easily anymore.

I had a bearing in my R150 tranny blow (the cage fell apart) and the guy who rebuilt it showed me the bearing play in the other bearings and how/why shifting was going to be getting more difficult if the other bearing hadn't blown anyway. I knew 2nd gear was a pain sometimes. The synchros he pulled out didn't look very worn at all, but the main shaft had some play and I guess even after you replace the bearings you have to shim the retainer to get rid of all the play. It didn't shift too bad before, but since the rebuild, it shifts AWESOME now.

Tim at www.transmissionexchange.com did the rebuild. Great guy. :)

Try the MT-90 first though. It should help, and its cheap compared to a rebuild!
 

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Due to the size and heavy duty design of the R series gears, this is a common complaint. This is due in part because the constant mesh teeth on the side of the gears are of a more fine design than Americian truck transmissions. This results in added surface area and more teeth to engauge.
Changing to synthetic oil will help.
Mainshaft retainer plate wear and rounding of the tips of the constant run teeth will also cause this problem.

Marlin
 

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Am I reading it correctly? You pay $1,000 and you have to give them your old trans? Or you pay $1,000 and you get $400 or so core charge back when you turn in your old trans? Guess I'm just not sure what the bottom line is...
 

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Are you talking about Transmission Exchange?

If so, it really depends on the tranny (the web site is old and vague).

My '97 tranny was $1000 for the rebuild, but it had some fancy/expensive/extra/3-piece synchros in it. He showed me the price differences in the rebuild kits.
I could have saved money if I'd exchanged it for an older style V6 tranny...

He had it done for me about 2 hours after UPS dropped of the rebuild kit. :cool:
 
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