Blown C4 transmission

[JAFHR]

Hello, I blew up my C4 auto transmission playing on the dunes. I don't think it was too healthy prior. Not sure what blew but I lost all forward gears. Should I be looking to get a replacement, rebuild, modify or get a C6.

Thx

 

[Viperwolf1]

Rebuild it. The forward clutch is burnt up.

 

[71Broncitis]

Rebuild with some upgrades. The C4 is a good transmission and can be made even better during a rebuild.

Sent from my XT1254 using Tapatalk

 

[garberz]

If you were in the sand then it got hot! Rebuild the one you have. Have the torque converter rebuilt also. Most importantly, get a trans temp gauge to keep an eye on it. It's tough to keep a C4 properly cooled, especially working them hard in the sand.

Mark

 

[JAFHR]

Thanks. Rebuild it is. Is there a trans cooler out there for the C4

 

[Rustytruck]

What is your tire size and axle gearing. Mismatched tires and axle gearing may over load the transmission.

 

[JAFHR]

I'm running 35x13.5 15's but I don't know the gearing on it. I'm running a 351W and it is very lack luster so I'm assuming it may be stock gearing. I'll be checking on it tomorrow.

 

[JAFHR]

What is the stock gearing on the 74? I had the tires off and spun the axle with the lug at 12 o'clock position. When it got back up to 12 o'clock, the drive shaft spun twice around. This seem like a very high gearing.

 

[DJs74]

What is the stock gearing on the 74? I had the tires off and spun the axle with the lug at 12 o'clock position. When it got back up to 12 o'clock, the drive shaft spun twice around. This seem like a very high gearing.

Probably 3.50s


DJs74

 

[sanndmann3]

I'd recommend 4.56 gears atleast to go with the 35" tires. I ran almost exclusivly in low range when out playing in sand. Helps keep trans cooler.
Definitely get a temp gageon it and rebuild. there are some good upgrades to do as well while you are inside. C4 is a great little trans and fairly easy to work on as well.

 

[JAFHR]

I'd recommend 4.56 gears atleast to go with the 35" tires. I ran almost exclusivly in low range when out playing in sand. Helps keep trans cooler.
Definitely get a temp gageon it and rebuild. there are some good upgrades to do as well while you are inside. C4 is a great little trans and fairly easy to work on as well.

Thanks, all great recommendations. I've got a rebuilt C4 coming with higher rated clutches and valve body upgrades. I'll be ordering 4:56's . I'm assuming Yukon is the favorite.

I'd forgotten, but I have ARB lockers front and back on this rig. I gotta assume that someone had changed the gearing in this. What should I be looking for in numbers or ?