NP 208 transfer case torque rating will it hold a 429? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-08-2003, 10:39 PM
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NP 208 transfer case torque rating will it hold a 429?

will a NP 208 transfer case hold up to a stock type rebuilt 429. the engine is a 72 to a 81 C6 to the weak link the 208. will the aluminum chain driven case hold the big blocks torque? if not should i go with a 205 or what? any advice.....ps im still instaling the 429. just bolted in the motor mounts and bell housing tranny mount and linkage comes tomarrow and then on to the cooling problem then to the exh. problems. etc i have some time. thanks in advance.

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Old 12-09-2003, 07:09 AM
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I found this info on a site, I don`t know how much it might help, since I honestly can`t find a torque rating on them. a friend of mine doesn`t like them since they are known to crack even with a small block behind them, but the best part is aluminum is easy to weld. so in the end it`s a coin toss honestly.

Chevy, Dodge and Ford all used variations of this transfer case. All were chain drive to the front output, with a light weight aluminum case. Most used a slip-yoke rear output. We are not aware of a Fixed yoke conversion for this case. While these units will hold up under moderately heavy off road use, they are not considered the preferred swap due to the chain drive and thin aluminum case.
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Old 12-09-2003, 09:27 AM
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The NP-208 is marginal but had most every GM engine in front of them that was available while in production including the 262 V-6, 305, 350, 6.2 diesel, 6.5 diesel, and 454, with manual and auto transmissions.
The ford and dodge line-up was similar but I am not as familiar with either of these.
I would recommend the 205, there are minimal upgrades available for this case but it is VERY stout.
I have extensive information for most of the New Process line of transfer cases, and some other makes and models.
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Old 12-09-2003, 10:31 AM
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The 208 will probably hold up behind a stock 429 if the transfer case is good shape and you do not plan on doing any harsh offroading. The 205 would definitely be the wise choice for strength and an easy retrofit. If you have any plans to beef up the 429 later, I would go ahead and do the 205 conversion now.

I'm bolting a Caddy 425/Th400 combo to a 208. If the 208 breaks, a 205 will be the replacement.
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Old 12-09-2003, 09:42 PM
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alright well i'll give her hell and see what goes first I have a while since the snows so slick I shouldnt hook enough to break any thing. thanks for the info. i'll keep you informed.
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