Tera Low

This place lists them also! But what is a Dana 27 rear?

http://www.kaiserwillys.com/category/82

 

I'm going to change my signature, correct my mistakes and update. Also trying to add more pictures, but our new cammera has made things difficult, picture content to large. The trans that I have always had in the jeep is a t-14a.

 

I'm now starting to lean towords the sm465. Finding parts can make thing difficult.

 

27 rears were used in Early Scout model 80's.

 

look or ask for genuine Spicer products
those listed are most likely foreign made, Spain, etc.

 

Terra low vs. 4 speed ?

On the plus side the Terra Low (3.15 gears) should easily fit into your 4" index (large hole) Spicer model 18
with a little case grinding. Certainly a much less involved installation than a 4 speed tranny.

The Terra Low downside is that your modified transfer case will no longer allow the same top speed when engaged in 4wd.
In other words you won't be cruising 30 MPH on the gravel roads when its in 4WD.

IMHO the installation of a 4 speed is the most versatile objective.
If one wants to further evolve toward exclusive hard core crawling the Terra Low becomes a future step in that direction.
Determined hard core crawlers will benefit from both the transmission and the ultra low transfer cases.

Some body asked whats a model 27 rear ? That belongs to the 2WD DJ models.

 

Also used in the Scout 80 and 800.

 

True enough, but it does not seem like much of a limitation to me.

Your top speed without winding out the engine will be about 20 mph in low range with the Tera gears. To me, that's plenty of overlap with high range.

It may be less convenient to have to stay in high range cruising up to the trailhead on dirt roads. However, in my experience, there are not a lot of trails where you go from 30 mph (dirt road speeds) down to crawling speed, and then back again, often enough to make the switch from low to high range burdensome.

 

Tim,
Appreciate your perspective.
Yeah I agree 20 MPH is a good average top speed for the Terra Low in 4WD.
Of course the exact figure really depends on a lot of specifics.

Here in the Ozark region we have a lot of backcountry gravel roads
crossed or disected by rocky streams. So for me 30 mph in 4WD is often a really good thing.
The off road area one frequents obviously has its effect upon the most desired of Jeep components.

 

Good points! You guy are realy talking me into a trany swap unless I have t-case issues, with would be unlikely since I just went through the model 18, new bearings and small parts.

 

Wait till you ask if you should get another Jeep or not. R)

 

I'm already looking. Will have to sneak it home. If I ask I already know what the answer will be.

 

I swapped in a 420 in my 57 cj 5 with a buick v-6. That was the best mod. I did. I thought about the terra low for my stock 48 2a but the better crawl numbers is not that much better for the money. The 5 is 7x2.46x5.38= 92to1 ratio and that is sweet. Another thing you half to think about if you are running an overdrive is that with the terra low you will half to switch your bowl gear. HTH fdpwr2a

 

465, 420, T-18........ Pick the one that you can install that keeps your drivetrain the shortest. What you do not want is a 4 " adapter shortening your rear driveshaft. Probably best is some sort of T-18 set-up. Others here can steer you to the shortest set-up.

 

If you do a tranny swap you will have it out anyway, good time to make sure everything is OK.

 

I used the Novak 1" adapter on my 465. My rear driveline is about 17"- 18" long. I know Herm sells the 1" AA adapter and I have had great dealings with him. He is great to talk to also.

 

I agree that Herm and Novak are great resourses. We are lucky to have them around. They will almost always get my busines. When I cant find it local I like to call Herm first.