Orange Crush 408

iTrader: (-2)

Has anyone done this? What is it going to take to match the 4x4? will I need to change the transfer case? Any and all infi would be appreciated. TIA.

Orange Crush 408

iTrader: (-2)

ttt...

Orange Crush 408

iTrader: (-2)

Ok, no one cares. Cool.

Racehead

That's not a swap I've ever heard about. Possibly people aren't answering because they don't know ?? Somebody on here will have the answer though , just have patience I'm sure you'll get an answer

hondo

iTrader: (2)

hey i care...
i would get a transfer case out of a 99 up truck with a 4l80 in it so it bolts right up(a floor shifted t-case not an auto track one), then you would just have to adapt your driveshafts, t-case linkage and maybe mod or swap the crossmember. i am not sure how the front diff lock works on the 99 up 4x4's, but it is electric like the 90 and im sure it'd be easy to figure out.

maybe use a pcm and harness from a 99 up 4x4 truck with a 6.0 and 4l80e, you'll obviously have to adapt the harness to the truck, speartech could hook that up. i think you would need to do some work with the VSS to get the 90 speedo to work, not sure about that.not to mention the obvious exhaust, fuel system, etc.
sounds like fun, do it

black02-z28

iTrader: (8)

Lots of Jeep guys have done the LS1 install, I am planning on one in my 1979 CJ 7 when I get the Camaro paid for. Check out advance adapters for some info.

Ed

Orange Crush 408

iTrader: (-2)

cool, thanks guys.

Muffracing

Your '90 burban has the driveshaft on the passenger side, Right? right. A '99 truck has the driveshaft on the drivers side. I would try using your stock np208 transfer case. A 4l80 is a th400 with OD. If your 1/2 t-case doesn't work you may need a 3/4 or 1 ton t-case. A good junk yard may be able to help. good luck.

malibu9in

iTrader: (4)

goto www.hpsalvage.com his name is Mark. He just got threw adding a 6.0 liter to a 97 sub its nat a 4x4 but he colud probably give some advise. Tell him Jason sent ya.

Remington H.

iTrader: (2)

sent you a pm, also there is a big difference between a 4x4 90 and a 2wd 97.

Remington

lmarino

It sounds similar to what I am doing with my 75 blazer. I bolted up a 4l60e behind a 5.3 to my np203 transfer case. Advanced Adapters sells a kit to make the new trans look like a 700r trans. It also accomodates the reluctor and pickup you will need to add for the vehicle speed sensor. The speed sensor is in the newer transfer cases; however, since the drive shaft is on the wrong side, I think best option is to keep your present transfer case and adapt the trans.

Remington H.

iTrader: (2)

Yeah, but there is a big difference between the 4l60e and 4l80e. They do offer a kit, but I would trust putting a spacer between the torque convertor and flywheel.

Remington

lmarino

Yeah, sorry, I didn't realize the speed sensor is apparently built in the 4l80e. It would probably be best to call a place like Advance Adapters and find out just what is needed.

01WS6/tamu

iTrader: (37)

You can also get an np241 out of a 89-91 suburban or k-5 blazer and it will have a much lower 4-lo than the 208. Both are good cases. You will just have to change the input shaft inside the t-case. But that is no problem BC you can order it for a newer 93-99 old body k-2500 with a 241 and you will be good to go.

01WS6/tamu

iTrader: (37)

You can keep the rear speed sensor in the transmission to controll the pcm because the 208 and 241 both have the pickup in the rear of the transfer case. 1990 was a split year though and some had cable speedos while others had electric. If yours has cable speedo you can retain it bc the transfer case can go either way depending on what parts you put into it.electric will be the speed sensor and reluctor wheel on the output shaft, mechanical will be the gear on the output shaft and the gear on the speed sensor but the tooth number of either will change bc this determines speedo accuracy.