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Old August 26th, 2008, 05:03 AM   #1
jeepnxj96
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Default 208 vs. 231

need some feedback. may be a dumb question but is a np208 better than my current 231? the 208 is out of an 80's ford 1/2 ton truck and has a fixed yoke output. I am building another xj and plan on running a ford rear end and the price on this t-case was right, what do ya think.
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Old August 26th, 2008, 06:50 AM   #2
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yup, the 208 is better than the 231. but you can't bolt a Ford 208 in place of your Jeep t-case without an expensive adapter.

The 208J has 32-spline fixed input and outputs (the best you can get for a 231 is 32 spline output). It's also 1/4"-1/2" shorter than a 231 with a standard HD SYE. the rest of the internals are way beefy compared to the 231, also.

point... buy a 208J not a Ford 208 which is practically worthless to you.

also, depending on the transmission you run, you might not be able to use the 208 (if your trans is 21-spline output). if you run an AX15, you'll need a 3/4" spacer (aka clocking ring) to make it work.
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Old August 26th, 2008, 07:02 AM   #3
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IMHO, don't bother.

Too much work for a t-case that has 0 aftermarket support and less of a low range. The 3/4" spacer will negate any length savings, and most 208s are now old enough that you will probably need to replace the chain. Not all 208s had fixed yokes, either. If you really need beef in your XJ, then don't bother with an aluminum case, chain drive TC.
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Old August 26th, 2008, 09:46 AM   #4
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IMHO, don't bother.

Too much work for a t-case that has 0 aftermarket support and less of a low range. The 3/4" spacer will negate any length savings, and most 208s are now old enough that you will probably need to replace the chain. Not all 208s had fixed yokes, either. If you really need beef in your XJ, then don't bother with an aluminum case, chain drive TC.

Work? What work?

All 208J's have fixed rear outputs, which is why its the recommended choice among the 208 family. The only thing you have to be careful of is that the 208J you're using did not come from an 80's J-20. They have 31-spline inputs.

Nobody is going to notice a 0.1 difference in the low-range ratio.

Assuming its for an XJ, the spacer is not a factor.

1310 yokes just like the 231.

A very, very, very, small percentage of people actually blow the money for different transfer case gearsets. Personally, I think that making an aftermarket gearset a factor in the decision is unrealistic, as people that are heading towards that kind of useage wouldn't be considering either case to begin with. Those people usually end up buying an aftermarket transfer case anyway.

Its less a "beef" factor than it is a financial and "makes sense" factor when you sit the stock 208J next to a stock 231J. Even if you have to buy a chain, you're still coming out ahead on the cost of a 208 chain (that's bigger than the 231) vs. buying a SYE for the 231.
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Old August 26th, 2008, 10:22 AM   #5
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i believe the tag was a 208c not for sure,it was getting dark. i picked it up for $30, i can make an adapter at work, not a big deal. it is fixed yoke output. pp is it a worthwhile attempt???
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Old August 26th, 2008, 10:28 AM   #6
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i believe the tag was a 208c not for sure,it was getting dark. i picked it up for $30, i can make an adapter at work, not a big deal. it is fixed yoke output. pp is it a worthwhile attempt???
If its a 208C, its a Chevy and I would not expect it to have a fixed rear output. Is at least a driver-drop case?

If you already know you need an adapter, then its not the 208J we're recommending. If I were you, I would count the input splines before doing anything else. If its a Ford and has 31-splines, its useless to you.
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Old August 26th, 2008, 10:31 AM   #7
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i'll check at lunch, it is the trunk of my car, it does have a fixed rear out put and is drivers side drop, i know that for sure, i just assumed i needed an adapter haven't checked into that.
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Old August 26th, 2008, 10:45 AM   #8
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can't you just swap in a 23 spline input and not use a adapter?
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Old August 26th, 2008, 10:50 AM   #9
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well back to the drawing board, it is a 208f with 31 spline in put, so if any one is in need of one i have one.
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