overdrive

[Keith Webb]

Originally Posted by gareth

Is there an overdrive available to fit on the back of my F15 4 speed?
what about different diffs?
I am looking to cruise at about 40 mph, sounds like i'm about to blow the engine at 35 at the moment, Gareth.

The White scout car diff centre fits and will gear it up comfortably but 40 MPH should be easy in a F15 without blowing anything up. The fan does make a lot of noise though. Having said that, most of the 4X4 CMPs are happier slower.

You should ask Euan his cruising speed in the CGT with the 292 Chev engine, and I recall a friend being amazed when he was passed by a cab 12 Ford doing over 60 MPH, although he did find out it had a Windsor. The higher speeds tend to flog the transfer cases out.

[japes]

Haven't done the math but what about the easier alternative of fitting 20 in. wheels? They fill the wheel wells better also (in my eyes at least).

J.P.

[gareth]

Many thank's for your input guys, being a 4x2 I thought it would be easy just to bolt on a overdrive unit and make a new prop does anybody know of such a unit, maker, website link?
Rear axle swap?
I have thought about fitting 20" rims so anybody in the uk have a set for sale?
I am not looking for higher speed just to give the engine and my nerves an easier time, Gareth.

[Ganmain Tony]

Gareth,

I know this is not the answer you're looking for, however....

Your F15 2wd should easily do 40mph as it is. The gearbox does have an unsettling note, but you'll get used to it. (at any rate they only get really noisey above 55 mph).

I'm posting this to give you some positive reinforcement about the ability of your machine as it is in standard form & to maybe, prevent you making a costly & unnecessary modification.

If you really really want to do something - go ahead with 20's but dont make the tyre diameter too big (as I have done) or you will never get up a serious hill without electric fuel pumps etc. 10.00X20's should be fine.

You've got a great truck.......enjoy