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Old 06-21-2010, 11:58 AM
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modifying a 74 Blazer's transmission and transfer case

I own a 1974 Chevy Blazer. I do not use it for heavy 4x4 action. The hardest I may ever use it is to go explore old logging roads etc in the mountains or pull a trailer.
I use it mostly as an every day highway driver. I want to go to a 700R4 transmission, but was told it would be in my best interest to also change out my transfer case and go with a 208.
I currently have the stock 203 transfer case. What kind of work would I need to have done to my vehicle to change over to a 700R4 transmission and a 208 transfer case?
I was told that in addition to the transfer case and transmission I would need to have my drive shafts adjusted, my carburetor adjusted, and get new lock out hubs for my front axle so it will operate as a 2 wheel drive vehicle.
Is there more I need to know or be on the look out for? What are the benefits of a 208 over a 203 other than the 2-wheel drive option?
Thank you for any help and insight you can provide.

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Old 07-31-2010, 09:52 PM
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With that many replacements it's going to be more of a transformation work than a modification one. Good luck let me see if I can help by asking some of my expert folks to chime in.
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Old 08-02-2010, 10:06 AM
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Quote:
Originally Posted by Travelling_Teacher
I own a 1974 Chevy Blazer. I do not use it for heavy 4x4 action. The hardest I may ever use it is to go explore old logging roads etc in the mountains or pull a trailer.
I use it mostly as an every day highway driver. I want to go to a 700R4 transmission, but was told it would be in my best interest to also change out my transfer case and go with a 208.
I currently have the stock 203 rebuilt transfer cases . What kind of work would I need to have done to my vehicle to change over to a 700R4 transmission and a 208 transfer case?
I was told that in addition to the transfer case and transmission I would need to have my drive shafts adjusted, my carburetor adjusted, and get new lock out hubs for my front axle so it will operate as a 2 wheel drive vehicle.
Is there more I need to know or be on the look out for? What are the benefits of a 208 over a 203 other than the 2-wheel drive option?
Thank you for any help and insight you can provide.

No one can hlep Im surrious as well.....
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Old 08-02-2010, 11:21 AM
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If you find a donor truck, its an easy switch. You can do it without a donor, but would have to get the right length driveshafts made up.

The NP203 transfer case gets a lot of bad press, but its really not a bad case. Its heavy, but durable, and the full-time 4WD is very convenient if you want 4WD but may be going on and off hard surfaces. If yours has been rebuilt already, that's even better.

For a swap you would need the 4wd version of the 700r4, and if you find one in a GM truck it will probably be mated to an NP208 already. Its probably just easier to buy the combo and install it together. Getting the right driveshafts is relatively easy, since that combo was used in early to mid eighties Blazers. Any decent driveshaft shop should be able to make them for you, or you may be able to buy them off the shelf.

You don't need the lockout hubs right away, but without them you will always be turning over the front axle, even in 2WD. You don't need a carb adjustment, but you need to add a TV cable for the 700R4, and some way to run the lockup torque converter. There are add-on kits from several sources.

Do you know what axle ratio your Blazer has? On pickups the 700r4 is nice because many have the 4.10 axle, but some Blazers have more in the range of 3.00-3.23 ratio.

Bruce
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