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k5 interchangeable transmission???

M

MohsinSK

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hi,

what other cars have transmission boxes that fit the blazer k5? will the caprice transmission fit?

regards,
Mohsin.
 
Only transmissions from fullsize 4x4 trucks will fit a 4x4 K5. 2wd is a different story, many car transmissions will fit in that case.
 
so 4x4 suburban, and 4x4 pick up will fit. what else?

the thing is, I have a TH350 in my blazer, and I'm trying to locate a used TH700, but we don't have many blazers in junk yards where I live. that's why I'm trying to know exactly what are the other cars I can use their transmissions.
 
Almost any "2wd" transmission can be made into a 4x4 transmission, with the correct parts. That being said, it's many times easier to just find a 4x4 transmission in the first place.
700r4's should be dime a dozen in almost any junkyard/ salvage yard.
I just gave away a 700r4, and the 241 transfercase with it, about 2 months ago, out of an 89 suburban. (I wished I hadn't as I want to build a 241/205 doubler.)
 
BoondocK5 said:
Almost any "2wd" transmission can be made into a 4x4 transmission, with the correct parts. That being said, it's many times easier to just find a 4x4 transmission in the first place.
700r4's should be dime a dozen in almost any junkyard/ salvage yard.
I just gave away a 700r4, and the 241 transfercase with it, about 2 months ago, out of an 89 suburban. (I wished I hadn't as I want to build a 241/205 doubler.)
Click to expand...
I think your missing the fact that the OP is in another country
 
Oops, yeah your right, my bad.

Sorry, MohsinSK. I didn't look at your Location.
In Saudi Arabia, Your guess is as good as mine, probably better as your there.:D
 
BoondocK5 said:
I just gave away a 700r4, and the 241 transfercase with it, about 2 months ago, out of an 89 suburban.
Click to expand...

yeah, put some lemon and salt on my wound :D

I hate the 1:1 ratio, and buying a new trany from USA will cost a fortune + shipping... ooh.

guys, help please.
 
What are the current specs on your K5? Year, engine, trans we know is a th350 but what about the transfer case. Knowing this we may have some better sugestions for you :D
 
jt512 said:
What are the current specs on your K5? Year, engine, trans we know is a th350 but what about the transfer case. Knowing this we may have some better sugestions for you :D
Click to expand...

my k5 is 1991, engine is small block 350 TBI. I really don't know what transfer case I have, I didn't take a look under my car, and I don't know how to translate the codes on the transfer case.

when off roading (sand of course) the car do very well. but on highway, the engine sounds like hitting too much RPM because of the trany ratio.

so, any suggestions?
 
You have an NP241 in your 91 K5. You can pull a 700r4 from an 1982 - 1993 Chevy 4x4 truck, suburban or K5 of either body style within that year range. The newer the transmission, the tougher it'll be. All have a 27 spline 6 bolt round transfercase pattern, which will mean that your current NP241 will bolt straight up.

The newer 4x4 truck also use a 6 bolt round pattern, they are electrically shifted. The manual transmissions are also an option, many are 32 spline however, which means you'd need to change the input shaft on your transfer case. I had a 2004 Chevy NV3500 5 speed manual transmission installed in my 1986 K10 with a 6.2L diesel and it nearly bolted straight in.
 
Being a 91, it's probably (assuming it hasn't been changed by anyone) a 700r4/NP241 combo. BUT, if its got the TH350 it's obviously been changed, it could be almost anything, maybe a NP203.
Snag us a picture and post it via Photobucket, then we can Identify it straight away.

Back to the original question what trans will fit? Almost any Fullsize Chevrolet 4x4 trans will bolt right up.
 
Russell said:
You have an NP241 in your 91 K5. You can pull a 700r4 from an 1982 - 1993 Chevy 4x4 truck, suburban or K5 of either body style within that year range. The newer the transmission, the tougher it'll be. All have a 27 spline 6 bolt round transfercase pattern, which will mean that your current NP241 will bolt straight up.

The newer 4x4 truck also use a 6 bolt round pattern, they are electrically shifted. The manual transmissions are also an option, many are 32 spline however, which means you'd need to change the input shaft on your transfer case. I had a 2004 Chevy NV3500 5 speed manual transmission installed in my 1986 K10 with a 6.2L diesel and it nearly bolted straight in.
Click to expand...

ok, that helped. so I can get newer trucks automatic trany if I can get the suitable ECU to control them, otherwise I can fit the 5 speeds manual, awsome. how did you change the input shaft in your transfer case? I mean, which input shaft you have now?

BoondocK5 said:
Being a 91, it's probably (assuming it hasn't been changed by anyone) a 700r4/NP241 combo. BUT, if its got the TH350 it's obviously been changed, it could be almost anything, maybe a NP203.
Snag us a picture and post it via Photobucket, then we can Identify it straight away.

Back to the original question what trans will fit? Almost any Fullsize Chevrolet 4x4 trans will bolt right up.
Click to expand...

it's night now in Saudi Arabia, I'll take a picture in the morning and i'll try to post it.
 
T Case Pictures

hi,

here are the transfer case pictures

get-4-2010-3mhdo9hm.jpg



get-4-2010-rwidatk7.jpg



get-4-2010-skj9z3ty.jpg



get-4-2010-ttsb2bk4.jpg



any idea which one is that T case?

another thing that keeps me wondering, what transmission do I have in my car!! I mean, I have only 3 speeds, but when I took a look under my car, I found a totally square oil pan in the transmission!!! I think that the square oil pan is the TH700R's isn't it? how come that I have only 3 speeds? even when moving the shifter up and down, it moves only 3 clicks after the neutral position. here are pictures of the oil pan

get-4-2010-gs8jfo90.jpg



get-4-2010-stetwg9u.jpg



get-4-2010-7eiigp0d.jpg



I know I ask too much, but what can I do!! it can't be saved, I just need to go back for experience guys like you..!!

regards,
Mohsin.
 
Kinda hard to tell but it looks to me like a th400 trans and a 208 Tcase.. Am I right?

The little red circular tag on the back of the transfer case will tell you what it is. Should say NP208 or NP241.

get-4-2010-3mhdo9hm.jpg
 
DR said:
Kinda hard to tell but it looks to me like a th400 trans and a 208 Tcase.. Am I right?

The little red circular tag on the back of the transfer case will tell you what it is. Should say NP208 or NP241.
Click to expand...

as far as I know, the th400's oil pan is not square in shape, it rather looks like the below

attachment.php


correct me if I'm wrong!!

regarding the red tag on the T case, I'll try to take another look under the car tomorrow..

regards,
Mohsin.
 
Looks like a 700r4 trans to me looking at the pan. the th350 and the 700r4 pans are close. They are both really close to totally square except the th350 has a corner cut off. That pan looks totally square with no corner cut off.

Rufus

On edit, really just a technicality but if it is the stock trans it is a 4l60 (NOT a 4l60-e) for a 1991. It really was just a change in name only.

Not sure how available parts are in your area but you could go to your local auto parts store and get a transmission pan gasket and see if it lines up with the pan on what you have. Should not be too expensive to do that and then you would be 100% sure of what you have.
 
I'm pretty sure the oil pan is totally square in shape, no corner cut off nor nothing. I can get the oil pan gasket to confirm, but as I said, it's square. and what drives me crazy, how does it have only 3 speeds!!!!! one more weird thing to mention, as far as I know, the TH700R4 has a 2 wires plug on it's right side, well, I have the wire under my car, but couldn't find the plug in the transmission itself!!!
 
That is definitely an NP241. The electronic speed sensor on the tail shaft gives it away :)

The transmission would have originally been a 4l60 / 700r4, and it most certainly looks like one to me. Try shifting it all the way down into 1st gear and try manually shifting the transmission up through the gears one at a time, if it revs higher, you'll be able to tell the shifts quite easily each time you bump the shifter up a gear. 1st gear on a 700r4 is pretty low, and you might just be missing it shifting.

The electrical should be on the driver's side (assuming your seat is on the same side as here in North America) right along the flat part of the transmission just above the face where the oil pan bolts up. It'll be a square 4 pin connector, and can have between 1 - 3 wires actually run down and into the transmission depending on how it is configured. Those wires are used to control your torque converter lockup solenoid. You can make sure it is working properly by driving in 4th gear and using your free foot to lightly press on the brakes just enough to make the brake lights come on. You should hear the engine's RPMs slightly increase as the converter unlocks, and slightly decrease as the converter re-locks when you turn the brake lights off.
 
Your combo is definately a 700R4/NP241. It is possible that the shift linkage for the trans is out of adjustment preventing you from being able to move the shifter all the way into 1st gear BUT that will not stop it from going into overdrive (4th gear). If you have a tach it would be alot easier for you to determine how many gears you are actually getting. Let me say this, i have a fresh rebuilt 700R4 sitting in my garage on the shelf because when i installed it it WOULD NOT shift into overdrive. I took it back to the builder and he swapped out the valve body with another and still no overdrive. What i'm saying is that you can have a 700R4 and for whatever reason only be getting 3 gears out of the 4.
 
I guess a good check would be put it in park(then make sure it is in park by trying to push it) then go down gears 3 clicks one click should b reverse second should be neutral and third should be overdrive. Im pretty sure to set the linkage on the tranny all u do is disconnect the pin then turn the gear selector thingy(dont know the name) on the driver side of tranny clockwise till it stops then once again try to push truck. THat should be park if im correct. Then make sure the gear selector is all the way up on park and connect it. Correct me if im wrong on any of this guys im jsut trying to remember from when we put the transmission back in my truck.
 
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