zf5 or zf6

[joedaddy_43]

Which one of these transmissions are stronger? i plan on doing a cummins swap and i can't pick which transmission to use.

[joedaddy_43]

anybody have any thoughts?

[trevor95f350]

I am not sure exactly which one is stronger but Id say just get the zf 5 because than you dont have to make your own crossmember and the zf6 just has a very low 1st gear

[dereku]

I say ZF6 because it will give you a better gear range and they are newer. Normally newer transmissions are designed to handle more power. Just my thought. Not to mention you hear a lot about high powered PSD and cummins using these transmissions.

[joedaddy_43]

thanks for the information guys, i still need to get the new motor and get ride of the 7.3 before i change the transmissions.

[Cowboyboots]

i have a 6 speed in mine, plett of power where i need it and never had a problem, everybody that i have talked to says the 6 speed can take more power