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Old 12-10-2018, 03:12 PM   #1
renegade6
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14 Bolt swap--Or not

I have a 72 with stock with TH350 and NP205 4.56 axles (Dana 44 and Eaton H052) front and rear and as a result, not much highway speed. I've been doing research and have come up with the following options:

-Swap to 14 bolt rear with 4.10 or lower ratio and put new R&P in front axle
-Leave current axles and put an overdrive transmission in it when I decide to swap to LS

What do you all recommend?

If I do put a 14 bolt, I want to confirm is that I want the one out of a cab a chassis.
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Old 12-10-2018, 04:51 PM   #2
sweetk30
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Re: 14 Bolt swap--Or not

no tire size given so i guess 31" for this testing info .

4.56 / 31" tire @ 70mph = 3655 rpm
4.10 / 31" tire @ 70mph = 3287 rpm

overdrive 700r4 swap

4.56 / 31" tire @ 70mph = 2422 rpm

overdrive swap nv4500 stick shift

4.56 / 31" tire @ 70mph = 2595 rpm

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

and your best bang for the buck is o/d trans swap . and for you i would prob do a built 700r4 and have it built with the correct length tail shaft for the np205 27 spline t-case you have so no changing parts there . just move the crossmember back and lengthen the front shaft and shorten the rear and swap the shift indicator . also have the trans built for stand alone tcc use .

and since your in texas call this guy up he is good . http://www.phoenixtrans.com/ greg is his name . i have got stuff from him and members on the other forum i am on have even got whole trans from him shipped in to them .
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Old 12-10-2018, 05:49 PM   #3
renegade6
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Re: 14 Bolt swap--Or not

Excellent, this is what I needed. I have 33" tires. Based on this, I may go with an LS 4L60 or 4L80 swap sooner.
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Old 12-10-2018, 06:19 PM   #4
sweetk30
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Re: 14 Bolt swap--Or not

your 205 will be harder to adapt to the newer 4l60 ls engine versions as they went BIG 6 bolt pattern on the back over the older 4 bolt style . so hunt for a 4 bolt older version if it was me .

4l80 swap = 32 spline input on the tcase and adapter also .

all this info is no good if you swap to a different t-case . like say a np241 from 90-91 blazer / suburban for the pass side drop and electric speedo guts to tie in to the computer .

the np205 can be made to run a tone ring and sensor for the computer needs offroad design has this service to offer .

both the 700r4/4l60 and 4l80 swaps = longer combo than your th350 is now .

glad this info helped you .
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85-k30lb the plow machine build .
85-c10sb summer fun toy .
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Old 12-10-2018, 06:31 PM   #5
renegade6
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Re: 14 Bolt swap--Or not

I've missed this forum. Here, you ask a question, you get an answer without a lot of static unlike some other 4X4 forums.
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Old 12-10-2018, 06:52 PM   #6
sweetk30
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Re: 14 Bolt swap--Or not

ya i hang our here a bit now and mostly on ck5.com


i stay away from nasty forums with p.i.t.a type people .

and there might be adapters for the newer 4l60 to np205 but i dont play with that combo just 4l80 to 205 stuff my self .
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85-k30lb the plow machine build .
85-c10sb summer fun toy .
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Old 12-10-2018, 07:50 PM   #7
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Re: 14 Bolt swap--Or not

Like k30 says...easiest(cheapest) way to go would be with 700r4od trans...even if you want to swap to LS later on it will bolt right up using adap without affecting drivetrain
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Old 12-10-2018, 08:06 PM   #8
sweetk30
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Re: 14 Bolt swap--Or not

and i bet after the 700r4 swap is done you will forget the ls swap .
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87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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Old 12-10-2018, 10:45 PM   #9
renegade6
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Re: 14 Bolt swap--Or not

Quote:
Originally Posted by sweetk30 View Post
and i bet after the 700r4 swap is done you will forget the ls swap .
I did a swap on my son's El Camino. Sure 8s nice just being able to just turn a key.
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Old 12-17-2018, 02:53 AM   #10
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Re: 14 Bolt swap--Or not

I have the 4l80 adapted to my np205. You have to make sure the output shaft had the full splines and just cut it to the right length. I bought my adapter from ORD and I’m pretty sure they make and adapter for the newer 60e.
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Old 12-17-2018, 11:54 AM   #11
sweetk30
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Re: 14 Bolt swap--Or not

i have a factory 4l80-e to round 205 adapter thats super clean i will be listing for sale soon .

i can tell you if your going to do a doubler kit and use a 241 adapter and bolt the 203 box on you need the 4l80-e to have a 4x4 tail shaft . or you will need to cut a hair bit off the 203 input gear .
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77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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