what t case for a sas

[sas'd96TAHOE]

i just sas'd my tahoe with a chevy axle up front and i'm wondering what tcase i should use.
shud i use a np205 or a np241?
which is stronger, and so on...

[HAPPYJOHN]

205 is stronger,( some would say, marginally, but it is.)
241 has lower low range.

What motor, trans? How will you use vehicle?

[sas'd96TAHOE]

it's got a 350 5.7L and a 700r4

[sas'd96TAHOE]

i'm gonna be offroading it until i get my next truck, and it's also my dd. goin on a trip to slick rock here in a couple weeks to try it out.

[swampers1226]

wait you said with a chevy front not ford right.

so it would be a 208 youd want to put in with your 700r4 to switch to passanger side drop but. i dont know if the 241 came pass. drop.
205 would need adapted shafts outa eather the tcase or tranny cuz your 700r4 is most likely 27 spline. 205s came 10,31, and 32 spline.
dont think ive ever heard of a 27 spline 205.

if you got with a 205 make sure it has the round mount pattern to the tranny adapter side which is mid 80s 1 tons the figure 8 type on the older ones has to use a adapter and the case has to get drilled

id go 208 as a easy swap, lower low range unless you got the cash

[sas'd96TAHOE]

yeah, it's a chevy front. the 88- i think 91 burb's came with passenger drop 241's. i heard someone saying that they're good for the swap too...

[sas'd96TAHOE]

and i also heard that the speedo on 88-98 chevy's plugged into the tcase, and the 241 did the same thing... is that right?

[joshua1086]

hey i did a sas on my silverado with a 4l60 which is the same as the 700r4 with a 27spline output and a 6 bolt round pattern. There are 2 things that nerrow this down the 27 spline and also if its a 2 wheel drive or 4 original then the shaft length is differant. with the passenger drop you have 4 options your cheapest being a 208 or 203 and the next step up which is what I would strongly recommend is a 88' to 91' 241 with a sye kit. it is strong light weight and has a decent ratio. Your other option you have if you really want the 205 is to adapt it which is possible through Advanced adp. but is supper expensive. So the option I took is to take a 203 which has a 27 spline input redrill the face to match the 6 bolt round pattern and do a doubler. honestly it was the same price as adapting the 205. plus i got 2 low gears.

Like i said earlier your best option is the 241 with the sye kit, which if you get the 88 to 91 will have an electronic speedo. I am in VA but I have one in the garage if you have a way to get it.


good luck if you wanna go doubler Offroad design is the way to go!

[sas'd96TAHOE]

thanks josh. i'm gonna go with the 241. can u send me a link to get the sye kit? i found a 241 in sac out of a 3/4 ton burb. thanks though.

[HAPPYJOHN]

Originally Posted by joshua1086

Like i said earlier your best option is the 241 with the sye kit, which if you get the 88 to 91 will have an electronic speedo.

My '89 (5.7, 700r4, 241), has a cable-driven speedo,
my '90 ( stolen ), had same set up, but electric speedo.

[sas'd96TAHOE]

wait, i don't know shit about tcases...
with a 208 or 203 i wouldn't need a slip yoke eliminator kit, right...?

[silver98Z71]

NP203 has a fixed rear yolk already. NP208 has a slip rear output.

[blazerboy85]

Originally Posted by swampers1226

wait you said with a chevy front not ford right.

so it would be a 208 youd want to put in with your 700r4 to switch to passanger side drop but. i dont know if the 241 came pass. drop.
205 would need adapted shafts outa eather the tcase or tranny cuz your 700r4 is most likely 27 spline. 205s came 10,31, and 32 spline.
dont think ive ever heard of a 27 spline 205.

if you got with a 205 make sure it has the round mount pattern to the tranny adapter side which is mid 80s 1 tons the figure 8 type on the older ones has to use a adapter and the case has to get drilled

id go 208 as a easy swap, lower low range unless you got the cash

any 205 the can bolted to a th350 is 27 spline first off. and this doesnt apply to you but in a post lower in the thready you dont need the advanced adapters bullshit to the the swap. all you do is buy a 35 dollar spacer and grind a quarter inch off the tranny output then just use the stock th350 to 205 adapter and its done very cheap at that.