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??Transfer case swap and gearing??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Big_Red, Jul 6, 2003.

  1. Big_Red

    Big_Red Registered Member

    Jun 11, 2002
    Likes Received:
    I own a 75' chevy 1/2 ton with a 8 inch lift and a 14 bolt rear and dana 44. It also has a 400 horse small block. It has a turbo 350 and a np 203 which is a full time transfer case. I also own a 75' chevy 1/2 ton chassis with a manual tranny and a np 205. I was wondering if i can directly swap the 203 for the 205 with out any changes if so what do i need to change? Or would it be better to buy a kit for the 203 to make it part time 4wd?
    Also i have a question about gearing. I have 37" super swamper boggers with 3.73's. It runs ok with the 3.73s but i want to be better off the line and i ready have a 1500 stall converter. My friend said i should run 4.88's. But i do drive a lot of highway miles and i want good gas mileage. What gears should i run?

    Please Help
  2. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

    Aug 28, 2002
    Likes Received:
    The np205 comes in to different mounting patterns, one for an automatic and one for the 465. The 465 case is pretty desirable because less were made than the automatic case. Sell your 465 and 205 for a 205 that mates to the 350 and 400 automatic. I wouldnt mess with the part time kit for your 203 because it would probably cost less to bolt up a super strong 205. I have a 3/4 ton converted 85 blazer with 35x16 boggers and 16.5x14 weld typhoons. I have 4.10's and I run a lot of highway miles (very hard on the boggers.)My boggers are just about as tall as the 37's but just a lot wider.I have a 500hp 406 sb that is quick with the 4.10's. 4.10's are good for fuel mileage and around town, but 4.56's are nice for power.4.88's are a bit low for a truck that see's freeway miles.
    85 blazer 14/10bolt 3/4 ton 9" lift 35"boggers 16.5x14welds 406SB/700r4 corvette comp. /forums/images/graemlins/angryfire.gif

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