t5 in cj5???

I was curious if you can put the t5 tyranny and its tranfercase in a 69 cj5 with the 225???? Has anyone tried that ...or is it easier to put in a Warn overdrive????

 

Tranny ....sorry Droid phone mistake

 

Too long, the Dana 300 requires a centered rear diff and an early is offset, need to adapt to a gm bellhousing transmission pattern, different clutch disc, etc, etc. Not saying it can't be done but not a bolt in by any means. The T-5 Jeep transmission is light duty at best imho after having repaired or rebuilt lots of them. The last several took 3 to 4 transmissions and a few new hard parts to make good ones....

 

warn OD is much easier. they only old CJ that a t5'll fit in would be a CJ6 (or M170).

 

do the warn OD-- stronger, easier, & better (more gear selections).

 

Yea I did more research and I think I like that way better too...does anyone know the the overdrive % with the warn conversion ..my Jeep has 4:10s

 

4.10 isn't really that low-how big are your tires?

 

it is 25% or 0.75 : 1

.0.75 x 4.10 = 3.07

mine has 5.38's

0.75 x 5.38 = 4.03

I'm running 225- 85 -15's. At 60MPH the engine is turning about 2800 RPM (F-134)

 

I will have 31s on it..... I do a lot of highway driving
.......thats cool Jeep power that's about what I would like my rpms to be around 70mphso I should be close

 

4.10s with tall tires is fine for the highway. With 30s (fairly short for modern tires) you don't even break 3000 at 65. A 225 in good condition will run forever at that speed. IMO no need for an overdrive with that ratio.

 

agreed.

If you want to do 80 & have enough power out of the 225, then am OD may be for you.

I can say that our Rubi has 4.10's & 31" (measured) tires. The OD is definitely needed/nice.

 

Can anyone guess what gas mileage would be like with stock 225 stock tranny 410s and 31s on highway ...I'd like to drive it to work every now and then but it's a 42 mile trip one way ...that's part of the reason I thought about an od

 

I'm going to guess no better than 16 to 18mpg, remember you are driving a brick with a huge flat windshield.

 

That's a little better than I thought but to drive it regularly it will need to be a little better ...SO I may have to get an od from herm in a few months ...I guess that would be to bad

 

BTW-are you sure you have 4.10's ?
Although it's certainly possible, that's not a common gear ratio in an early CJ5

 

I doubt that an overdrive will improve your fuel economy with that axle ratio. If you really want economy, you'll need to slow down to the lowest safe speed for the highway, say 55 mph. That will put you at 2500 RPM or less. Then with the overdrive, you'll drop the RPMs at that speed to 1900. At that low engine speed, you may have to use a lot of throttle to keep going, which will richen the mixture and reduce economy. I would be very pleased with any CJ that got 16-18 mpg ... expecting more is unrealistic, regardless of what modifications you make.

The overdrive really helps the Jeeps that came with factory ratios of 5.38 or 4.88. Maybe someone on here has a V6 CJ with 3.73s and runs an overdrive. They can give you an idea of mpg - but IMO 16-18 is excellent mileage for one of these Jeeps.

 

Colojeepguy no I'm not sure about the gears that's just what my Dad said was in it and he could be wrong ...timgr I agree with you on that to ... I drive a frontier 4cyl 5speed and it turns around 3k at 70 and it gets around 24-27 MPG but it's not quite the brick the Jeep is ...oh well once a week to work is still cool.... its should be coming home soon my grandmother wants me to help her find the title today ....I've been wanting this Jeep since 1980 when I was 8 I can't wait

 

ditto on all of this. 18MPG on the highway, with any Jeep, is about as good as it gets. The highest I've seen our lie-o-meter read is 21MPG in our JK. That was with a tailwind, my wife driving, and all flat interstate. Figure that to be 19-20 actual MPG. They don't call them lie-o-meters for nothing.

 

You can probably make a substantial down payment on a used, small, cheap economy car for what the OD will cost to buy and install. Don't forget you'll need a custom driveshaft and will have to regear the speedometer. Jeeps engines simply were designed for economy even though it is a small engine. Add in the tall, flat windshield; blunt radiator, box-like body and all the wind catching drive train hanging underneath and I'd frankly be surprised if you even get 16 MPH and even then you'd have to drive at well below the normal rush hour speeds which would create a whole other set of problems! And considering how much wear and tear it would add to your Jeep and those big, expensive off-road tires, and how break down prone any old vehicle is going to be I wouldn't even consider using an old Jeep as a DD. If you want to drive it to the office Christmas party that's one thing but I'd never recommend driving back and forth, even on an occasional basis.

Been there, done that, and had to pay and arm and a leg for gas and auto repairs plus spend MOST of my free time working on the vehicle!