which overdrive is worthit?

[secretagent]

i have a 75 fj40 with a 4spd and chev 350. top speed is only 55mph without sounding like it's going to greneade. i was thinking of adding an overdrive unit but i know nothing about them, any advice wouuld be gretly appreciated>

 

[Texican]

Go to 35" tires mine will do 75mph all day long @ 2500 rpm with 4.11 diffs.
Butch

 

[Ponce]

For the price of an over drive you would be better off putting in another tranny. I have the Ranger OD in front of my stock 4 speed and t-case. If I had it to do over again I would use a turbo 350 or 700R4. Before I did my conversion I was able to go 65 with no problem. Have you looking inside your tranny to see what it looks like?

 

[69vortec]

Nv4500

 

[Ponce]

O ya I forgot about that one.

 

[folsom50]

Go to 35" tires mine will do 75mph all day long @ 2500 rpm with 4.11 diffs.

That's the easiest fix, a lift and taller tires.

If you want to really work, then a nv4500. You could go ranger also, but either way since you have a 350 mounted already, I'm assuming that you'll have to cut your motor mounts off and slide the engine ahead to get a rear driveline that would work.

 

[sfrolich]

NV4500! 2000 RPM @ 65 with 33" tires

Scott