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203 Range Box added later.

Mudbone

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I am planning some major upgrades to my K5 this summer. Trying to allow for future upgrades without having to tear things out or totally apart. My current plan is use a 700R4 trans with a Lomax 205. I want the OD gear because the rig will be driven on the road. Also, the 3:1 first gear in the 700R4 and Lowmax with give me 9:1 from the crank. Which is close to the 10:1 you get with a 203/205 doubler and 2.5:1 first gear in a TH400. (Yes, I know you can't get a Lowmax right now.) I am going to have a strengthened 700R4 built so it will have a 32 spline output shaft to mate to the Lowmax.

Would it be possible to put a 203 range box between these two at a later date without changing shafts in the Lowmax or the 700R4? If I understood what I have read, the 203s that came behind 400s had 32 spline inputs. Would this work or would the output shaft on the 700R4 be the wrong length?
 
you plan on redoing every thing 2 x ?

drive shafts / shifter linkage / tcase cross members / floor pan mods when 203/205 install . and other things .

better do it all at 1 time. and just do a stock 27 spline shaft in the 700r4 now and get it for the 203/205 required length when remaned. then bolt all of it up.

and most all guys that do or did 203/lowmax say its not realy worth it in the end.

2.0:1 or 4.0:1 work good in the end.

i say search and read some more. and check my 4l80-203/205 build in the tech section to show how step by step to do a 203/205 with ord kit and 3 stick shifters. and reman of both cases.

play with this also http://www.grimmjeeper.com/gears.html

info here http://offroaddesign.com/catalog/doubler.htm
 

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