Rocket Surgeon
OBS Enthusiast
I have two trucks, both 8 lug K2500 5.7 NV4500s with 241C with 14FF 3.73 axle ratios.
One has the G80, the other does not. I think all else on the axle is the same.
Reminder that these are 14 bolt Full Float; we are not speaking about the gov-bomb in the 10 bolt axles.
I have located a k2500 rear axle of the same vintage, but with a different ratio 4.11.
I am not interested in changing up ratios.
Sorry, I forgot to state it is a G80 4.11
questions:
1) Both G80 axles are pretty much locked from a stand still. They are locked the moment you try to move them. I presume this is normal in the 14FF?
2)Is a used but apparently good 14FF gov lock worthwhile to utilize, vs aftermarket parts?
3)can I change the pumpkin into my open 3.73 ratio diff, using my 3.73 ring on the donor pumpkin?
4)I am aware that the G80 requires a non slip additive fluid... does that include the 14FF, and/or all g80 variations on all gmt400 possible axles?
5) I still have not seen a good definitive info on one other thing I would be ok with, which is a compatible gmt800 axle or equivalent to what I have currently. Disc brakes would be nice. But the spring and shock mounts may need moved?
6) I do not like the aftermarket disc brake conversions that do not support the caliper, has anyone looked at gmt800 axle flanges that support a caliper to see if they can be fitted to a gmt400 axle?
I have some other thoughts to go on:
If I was to change the ratios, I would prefer to go to a smaller number like 3.43 for better highway efficiency. I feel I have enough low gear.
Also as a manual, I do not have to worry about shift tables. I shift were I need.
I also have a pending mod I would like to accomplish. Install a cut off switch to front diff actuator to enable 2wd low, giving the capability of real low gear with easy turning and control. It is easier to park when inches are not there to spare in low gear.
Thanks for your knowledge.
One has the G80, the other does not. I think all else on the axle is the same.
Reminder that these are 14 bolt Full Float; we are not speaking about the gov-bomb in the 10 bolt axles.
I have located a k2500 rear axle of the same vintage, but with a different ratio 4.11.
I am not interested in changing up ratios.
Sorry, I forgot to state it is a G80 4.11
questions:
1) Both G80 axles are pretty much locked from a stand still. They are locked the moment you try to move them. I presume this is normal in the 14FF?
2)Is a used but apparently good 14FF gov lock worthwhile to utilize, vs aftermarket parts?
3)can I change the pumpkin into my open 3.73 ratio diff, using my 3.73 ring on the donor pumpkin?
4)I am aware that the G80 requires a non slip additive fluid... does that include the 14FF, and/or all g80 variations on all gmt400 possible axles?
5) I still have not seen a good definitive info on one other thing I would be ok with, which is a compatible gmt800 axle or equivalent to what I have currently. Disc brakes would be nice. But the spring and shock mounts may need moved?
6) I do not like the aftermarket disc brake conversions that do not support the caliper, has anyone looked at gmt800 axle flanges that support a caliper to see if they can be fitted to a gmt400 axle?
I have some other thoughts to go on:
If I was to change the ratios, I would prefer to go to a smaller number like 3.43 for better highway efficiency. I feel I have enough low gear.
Also as a manual, I do not have to worry about shift tables. I shift were I need.
I also have a pending mod I would like to accomplish. Install a cut off switch to front diff actuator to enable 2wd low, giving the capability of real low gear with easy turning and control. It is easier to park when inches are not there to spare in low gear.
Thanks for your knowledge.
Last edited: