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208 to 241-Search gave me a headache

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MarcS

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Can somebody help me out please ??

I have a 700r4 w/ a 208 xfer case. While its out of the truck(87 K5), I'm thinking about getting a 241 case instead.

Basically, what is involved ?
Are the cables/shifters different ?
Input and outout splines ?
Mech speedo ?


Can you guys help, or at least help me with a better search for threads ?

Thanks,
Marc
 
MarcS said:
Can somebody help me out please ??

I have a 700r4 w/ a 208 xfer case. While its out of the truck(87 K5), I'm thinking about getting a 241 case instead.

Basically, what is involved ?
Are the cables/shifters different ?
Input and outout splines ?
Mech speedo ?


Can you guys help, or at least help me with a better search for threads ?

Thanks,
Marc
Click to expand...

Shifter and pattern = same
Mounting and adapters = same

Speedo cable = Same in 1989 for sure , afterwards they were electric speedos as far as I know . So get a 1989 case . Someone can post up if 1990 was speedo or not .

Input splines = same , I.E 27 spline for th700r4 , 32 spline for th400 sm465
Outputs = same . 32 spline rear for slip yoke , flange driveshaft front .
 
1990-91 electric speedo. Easy fix, convert to the (better) electric speedo at the same time. :)
 
i put an 89 241 in my 88 and it had electric speedo...just see if you can find a mechanical speedo "bell" from another 241 and they swap right over
 
Donor vehicle must have been mismarked or something, everything up until 1990 was mechanical.

Right off the tech specs page:

"Notes:
A new electronic speedometer was also introduced for 1990, along with non-asbestos brake linings."

Not trying to be an ass about it or anything, but when it comes to the electric speedo conversion, there is needless confusion as to when it came out.
 
That I'm not sure. I was going to a slip yoke eliminator when I get it.
 
the front driveshaft will be exactly the same length, unless you decide to clock the case up.

The rear will definitely be longer with an SYE....
 
MarcS said:
That I'm not sure. I was going to a slip yoke eliminator when I get it.
Click to expand...

If your going the slip yoke eliminator route, you can use any case. Just buy the output snout of your choice. You just cant go super short SYE. You will need a mech speedo sleeve though, the one that the driven gear rides in. The 208 and 241 sleeve I believe are the same. Junk yards have plenty of them.
 
it may be easier to go with a electric speedo 241 and a electric speedo from the 90-91 models. I know I had a heck of a time finding a mechanical speedo 241, let alone just the rear output to convert a electric to mechanical.

I also swapped to TBI after, so an electric speedo would have been the better route for me too...oh well.
 
randy88k5 said:
If your going the slip yoke eliminator route, you can use any case. Just buy the output snout of your choice. You just cant go super short SYE. You will need a mech speedo sleeve though, the one that the driven gear rides in. The 208 and 241 sleeve I believe are the same. Junk yards have plenty of them.
Click to expand...

Great info guys.

I wanted the lower gear in 4 low. That's why I want to find a 241 over the 208. I'm not to worried about the speedo. I think it was JB Conversions, have a elec to mech, but it's expensive.

Another question. If I do clock it up, I'm guessing I will need a new crossmember ??? Right ???
 
no the stock one is okay, but most will make a custom one so that they get even more ground clearance. THe stock crossmember has that notched area for the front output yoke. Since you are moving that up some, you can probably just mod the one you have to work....but it might just be quicker and easier to make a whole new one. Not 100% sure about this, but you may have to do some pounding on the floor and tranny tunnel to make some room for the case, since it will be moving up some. I have heard a 1" body lift can help.
 
only problem is i wouldnt go with a 208 since most of the sye kits for the 208s ive seen were homebrew. i have the jb conversions sye on my 241 and i think its the shiznit.

dorian, as for the misprint of the vehicle it could have just been a change during the production year in 89...who knows?
 
You aren't worried about the speedo, but assuming your '87 is the TBI in your profile, IT will. Not running a speedo makes a DRAC conversion even more sensible.

Still can't buy the '89 getting '90 parts, the trucks are way too different in every regard for that to be even likely. Sorry. :)

Show me GM literature (service manual, wiring diagram, update) that shows anything other than mechanical in 1989, and I'll stand corrected. Until your post, it's been universally accepted that 1990 was first year electric speedo. Not trying to pee in cheerios here. :)
 
dyeager535 said:
You aren't worried about the speedo, but assuming your '87 is the TBI in your profile, IT will. Not running a speedo makes a DRAC conversion even more sensible.
Click to expand...


Yes I have a 350 w/TBI. What is DRAC conversion ???
 
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