NP203 strength?
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NP203 strength?
How strong is a NP203 converted to part time? Also, how does the converted 203 work as far as when it is 4wd, and 2wd?
I just bought this truck, and it has a 351M/400 in it. (not sure which) I don't plan on doing much to the engine shy of a Full-On Edelbrock parts. I want to use the Edelbrock cam, 600cfm carb, and non-EGR intake. I have a couple burnt valves, so in replacing them, I will also have a 3-angle valve job done.
Thanks,
Matt
I just bought this truck, and it has a 351M/400 in it. (not sure which) I don't plan on doing much to the engine shy of a Full-On Edelbrock parts. I want to use the Edelbrock cam, 600cfm carb, and non-EGR intake. I have a couple burnt valves, so in replacing them, I will also have a 3-angle valve job done.
Thanks,
Matt
Senior User
Joined: Jun 1999
Posts: 361
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NP203 strength?
Matt,
The NP 203 is probabley one of the strongest chain drive T cases available.Im not sure who makes the part time kit,but while your in there you may want to do a master rebuild on the entire case,I dont think they(rebuild kits) are very expensive.The 203 has a very stout cast iron case,but doesnt have a super low "low range",(2.01:1,as compared to the BW case at 2.69:1).I dont have a cross section drawing of the 203 in my office here,but one of the few problems with the older T case designs were the use of spur gears instead of planetaries,and they often had more than one main shaft.This tends to make them a little less efficient than say the newer Borg Warners,(which transmit about 98% as compared to 90% for the NP 203).More importantly though is that there are quite a few more load bearing components in the case,meaning good maintenace is required to keep it very reliable.
The NP 203 is probabley one of the strongest chain drive T cases available.Im not sure who makes the part time kit,but while your in there you may want to do a master rebuild on the entire case,I dont think they(rebuild kits) are very expensive.The 203 has a very stout cast iron case,but doesnt have a super low "low range",(2.01:1,as compared to the BW case at 2.69:1).I dont have a cross section drawing of the 203 in my office here,but one of the few problems with the older T case designs were the use of spur gears instead of planetaries,and they often had more than one main shaft.This tends to make them a little less efficient than say the newer Borg Warners,(which transmit about 98% as compared to 90% for the NP 203).More importantly though is that there are quite a few more load bearing components in the case,meaning good maintenace is required to keep it very reliable.
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