lunchbox
1/2 ton status
first the rear end now a blown up transfer case, ive had a bad month. i just blew up my transfer case and im gonna go to the pick and pull tommorow, what should i be looking for? one out of a suburban? or another blazer?
CK5
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tranfer case question?
- Thread starter lunchbox
- Start date
Need the year of your rig! 
(fill out your profile, some us actually check that if it's not in the post hint, hint) A signature line also works.
(fill out your profile, some us actually check that if it's not in the post hint, hint) A signature line also works.
lunchbox
1/2 ton status
dyeager535 said:Need the year of your rig!
(fill out your profile, some us actually check that if it's not in the post hint, hint) A signature line also works.
soory about that. Its an 87 gmc jimmy with a 305 and a 700r4.
I believe any GM 1/2 or 3/4 ton from 1989 down to 1981 will have a case you can use. Someone will correct me if that's wrong.
You should have an NP208 case in there now, I believe the mechanical speedometer NP241's will bolt straight in as well. (again IIRC, 1988-89) They are more desirable than the 208, but if you can't find an NP241, I wouldn't cry.
You COULD use one from a 1990 or 1991 truck of the same body style you have (not the '88+ bodied trucks) but that will have the electronic speedometer, making you change a few things around.
You should have an NP208 case in there now, I believe the mechanical speedometer NP241's will bolt straight in as well. (again IIRC, 1988-89) They are more desirable than the 208, but if you can't find an NP241, I wouldn't cry.
You COULD use one from a 1990 or 1991 truck of the same body style you have (not the '88+ bodied trucks) but that will have the electronic speedometer, making you change a few things around.
lunchbox said:
Should then have an NP208. Any 4WD Chebby from that year would work -- Burb, Blazer, pickup, all use the same t-case ... as to which other years, someone else will pipe up.
I know that by '90 the NP241 was in use, with the digital speedometer (VSS, DRAC) stuff, so you'll want to avoid that to keep your swap plug-n-play.
-- A
My theory..
I try to get tranny and transfer cases from 1/2 tons,figuring they would be less likely to have been hauling lots of weight or abused...see if the donor truck had a class 3 trailer hitch,that means it was hauling a camper,or other heavy loads,and the drivetrain might be beat!...the worst trucks to use parts from are ones owned by contractors,1 tons especially..they get beaten by employees,and are often overloaded and neglected..but we need 1 ton parts,and sadly,there just isn't many to choose from here...
I try to get tranny and transfer cases from 1/2 tons,figuring they would be less likely to have been hauling lots of weight or abused...see if the donor truck had a class 3 trailer hitch,that means it was hauling a camper,or other heavy loads,and the drivetrain might be beat!...the worst trucks to use parts from are ones owned by contractors,1 tons especially..they get beaten by employees,and are often overloaded and neglected..but we need 1 ton parts,and sadly,there just isn't many to choose from here...
lunchbox
1/2 ton status
that makes sense, so the transfer cases were the same in 1 tons and 1/2 tons?diesel4me said:I try to get tranny and transfer cases from 1/2 tons,figuring they would be less likely to have been hauling lots of weight or abused...see if the donor truck had a class 3 trailer hitch,that means it was hauling a camper,or other heavy loads,and the drivetrain might be beat!...the worst trucks to use parts from are ones owned by contractors,1 tons especially..they get beaten by employees,and are often overloaded and neglected..but we need 1 ton parts,and sadly,there just isn't many to choose from here...
big83chevy4x4
3/4 ton status
yep, 81-89, 90-91 have electric speedo. the 700r4 and th350 versions have a 27 spline input. the sm465 and th400 versions have a 32 spline input. i have seen a few 4 speed overdrive manual trannys, these have a 27 spline also.
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big83chevy4x4
3/4 ton status
the 1 tons have a np205, they won't bolt into your truck. the 1/2 ton and 3/4 ton are the same though.lunchbox said:
lunchbox
1/2 ton status
so i could find one in a suburban?big83chevy4x4 said:
big83chevy4x4
3/4 ton status
yeplunchbox said:
lunchbox
1/2 ton status
how hard of a project is replacing the t-case, any tips?
its not that bad with the newer cases they are no where near as heavy, you have to remove the shifter, drive shafts and then unbolt the transfer case from the adapeter, its not to bad at all
better know your transimittions though...mine might be a rarety but i got an 87 burb with a f/i 350 but it has a turbo 400/208....is this a rarety to find?
twoslo4five0 said:
Nah, the 3/4 Burbs have the TH400, and through '87 would have the 208.
My '90 Burb had a TH400 and a '241.
-- A
lunchbox
1/2 ton status
so my dad and i went back to where i broke down and we tried to pullit home with his truck, the thing wouldnt budge, it was dragging the front tires . we had put the tranny and t-case in nuetral and the thing wouldnt move, and when i called the tow company they said they couldnt help. what does this sound like and how the heck am i gonna move this?
if the transfer case is locked up pull the drive shafts, just remember though that you will not have park so use the parkign brake so it does not roll away
G
goldwing2000
Guest
Yeah, sounds like you grenaded enough parts inside the t-case to lock everything up. Good job! 
Just disconnect the driveshafts from the axles and tie them up to the bottom of the truck. If you pull the rear shaft completely out, you're going to be dribbling fluid all the way home.
And don't lose the hardware.
Leave the tranny in park and the t-case in neutral, so you can start the engine and have brakes.
Just disconnect the driveshafts from the axles and tie them up to the bottom of the truck. If you pull the rear shaft completely out, you're going to be dribbling fluid all the way home.
And don't lose the hardware.
Leave the tranny in park and the t-case in neutral, so you can start the engine and have brakes.
lunchbox
1/2 ton status
so it doesnt sound like any of this hurt my tranny did it?, its just the t-case?
From what it sounds like the planetiary in the transfer case exploded I have seen this several times with rigs that were wheeled hard or run out of oil. pull all the drive shafts and put them in the truck.
bigred81
bigred81
