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Discussion Starter · #1 ·
I was planning on buying a B&M shift improver kit for my '77 k-20 4X4 with a th350. Should I buy the regular shift improver kit and put on the RV/Heavy Duty plate or buy their light truck shift improver kit?
 

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The light duty wont hit as hard as HD/Rv shift kit.If it's sloppy now,go with the HD.If its tight now and you want to improve it you will have to go easy with the drill bits on the separater plate or you will be upset when it bangs to hard when shifting.If its a plow truck,you dont want to up main line press to much,it will bang hard from F-R when you shift.

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John D
 

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PlowSite.com Veteran
Joined
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2,153 Posts
The light duty wont hit as hard as HD/Rv shift kit.If it's sloppy now,go with the HD.If its tight now and you want to improve it you will have to go easy with the drill bits on the separater plate or you will be upset when it bangs to hard when shifting.If its a plow truck,you dont want to up main line press to much,it will bang hard from F-R when you shift.

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John D
 
G

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i've had a b&m shift kit in my 77 1/2
ton for a year and a half now and i'm
taking it out tomorrow. it is in rv hd
mode and bangs a lot, even more so in
4 low. the trans was rebuilt before the
kit was installed by a local shop that
only does auto trans work. otherwise the
trans is fine, i tow a trailer occasionally.
i'm putting in an ATP shift improvement kit
that does'nt increase firmness but does increase oiling. a trans temp gauge &
an oil cooler along with regular fluid
changes will keep your trans alive for
a long time.
4LOW
 
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