no reverse in SB 727

[RD]

reverse will not engage when shifter is switched into the reverse position.  engine gets revved to 3000 rpm and the vehicle will move slightly backwards, but not fully engage.

what i did:  1) adjusted band appropriately 2) replaced rear servo seal and tested the rear servo for proper seal 3) completely dismantled and cleaned the valve body.

causes: I think its the front clutch assembly (have yet to disassemble the transmission and check), any thoughts?

[MYTMOPR]

Trans fluid, what about the tranny fluid???

[RD]

Trans fluid, what about the tranny fluid???

believe me, there was enuff tranny fluid 

[John_Kunkel]

If the front clutch was at fault I would expect to see some sort of problem with 3rd gear also.

Have you tried air checking the front clutch?

[RD]

no i have not.  I forgot to mention that 1st, and 2nd engaged fine, never did try to get the thing up to speed and let drive (direct) actually engage.

[Lightning]

when my tranny went in February, I also lost reverse and 3rd gears.  I had to have mine rebuilt because the sprag was destroyed, it cost me $500 to have it totally rebuilt.

[KMPX2]

Did you run it long enuf so the fluid got to all the vaives. Seems like the rev valve is the last one to get pressure

[RD]

yeah sure did.  engine operating temperature, ran through all the gears.  I believe its the front clutch or the sprag that has failed.  I have yet to tear it apart though 

[John_Kunkel]

Sprag? If first gear works OK the sprag isn't bad.