No forward gears suddenly, but still have reverse

[jcldtmom]

82 C10: Drove for 2 straight weeks with no issues, then went to drive it next day again and nothing. No forward gears at all. Yet I had reverse all day long. Fluid looked good, right color, and was already topped off. Everything is all original in the truck. Straight 6 and original Transmission. I can't figure it out cuz the truck runs great. It's supposed to go to my son when he gets home from Japan, (Navy) but in the meantime, I was gonna be driving it. We named her Frankie, short for Frankenstylish, cuz she's got plenty of character. So please don't hurt her feelings. Thank you

 

[NickTransmissions]

82 C10: Drove for 2 straight weeks with no issues, then went to drive it next day again and nothing. No forward gears at all. Yet I had reverse all day long. Fluid looked good, right color, and was already topped off. Everything is all original in the truck. Straight 6 and original Transmission. I can't figure it out cuz the truck runs great. It's supposed to go to my son when he gets home from Japan, (Navy) but in the meantime, I was gonna be driving it. We named her Frankie, short for Frankenstylish, cuz she's got plenty of character. So please don't hurt her feelings. Thank you

Assuming your C10 has a TH350, your low roller one-way clutch has likely failed - common with those transmissions. Anything beyond a stock rebuild should receive a 4L60E center support with new BW low roller one-way clutch assembly...The 4L60E center support swap is drop-in, meaning you don't have to do any other mods to the transmission...Just take the TH350 center support w/its weak low roller clutch out and install a 4L60E center support with its much stronger low-roller and you won't have this sort of failure again.

 

[jcldtmom]

Sorry, I forgot about engine size. She's got the straight 6 in her. Automatic transmission. 2 wheel drive.

 

[AuroraGirl]

Assuming your C10 has a TH350, your low roller one-way clutch has likely failed - common with those transmissions. Anything beyond a stock rebuild should receive a 4L60E center support with new BW low roller one-way clutch assembly...The 4L60E center support swap is drop-in, meaning you don't have to do any other mods to the transmission...Just take the TH350 center support w/its weak low roller clutch out and install a 4L60E center support with its much stronger low-roller and you won't have this sort of failure again.

an upgrade too would be to get a v8 th350, I forgot what exactly was different , I think the amount of clutches?

New modulator, make sure rubber hose sections at the front and end of the vacuum line are new and fit tight, a quality filter and filled with dexron vi, an additional cooler if the truck gets used to tow (not just the end tank)

but op should replace the radiator (or the end tank cooler , which is doable if you dont mind removing the end tank and sealing it up again) and the cooler lines

magnetic inline filter for the outlet to the cooler

just some ideas

 

[SquareRoot]

an upgrade too would be to get a v8 th350, I forgot what exactly was different , I think the amount of clutches?

New modulator, make sure rubber hose sections at the front and end of the vacuum line are new and fit tight, a quality filter and filled with dexron vi, an additional cooler if the truck gets used to tow (not just the end tank)

but op should replace the radiator (or the end tank cooler , which is doable if you dont mind removing the end tank and sealing it up again) and the cooler lines

magnetic inline filter for the outlet to the cooler

just some ideas

Let's just jump right to the LS/NV4500 swap and get r done.

 

[AuroraGirl]

Let's just jump right to the LS/NV4500 swap and get r done.

over the 250 the OP has, that would be night and day