DavidB
1/2 ton status
I think we should all start chipping into a pot for a prize for motivation...whomever finishes first gets it 
CK5
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208 doubler project...updated 3-10-06
- Thread starter ryan22re
- Start date
roadnotca
3/4 ton status
That would blow-off the mud!Blue85 said:
big83chevy4x4
3/4 ton status
thanks one hell of an overdrive.Blue85 said:
big83chevy4x4 said:
It's ideal for gas mileage because your engine is at 420rpm on the freeway and fewer revolutions means less fuel consumed. This also adds to the longevity of the engine. It's also easier to identify a problem cylinder since each one is only firing every 3.5 seconds. Just make sure your engine can produce at least 600 lb-ft of torque at 400rpm so you can go up hills and stuff.
DavidB
1/2 ton status
roadnotca
3/4 ton status
and you like coffeeBlue85 said:
bajaviking
1/2 ton status
Another piece of usefull information that I don't know how I could function without 
any updates??
Negative. No progress bring made at this point. Just killed another engine at work tonight (thats 3 engines in last 12 days for those keeping score). And since I do all of my machine work at work, I haven't had any time to mess with it.
Several other members are working on projects like this, I'd love to see them post up progress pics in this thread. Maybe somebody can finish it.
Several other members are working on projects like this, I'd love to see them post up progress pics in this thread. Maybe somebody can finish it.
sope
1/2 ton status
Thought I'd bring this back.
Has anyone completed one yet?
Has anyone completed one yet?
The idea of using a 2.7:1 planetary in front of a conventional rangebox seems to have been done a few times commercially in the last 18 months (since this thread started).....
The NWF BlackBox is one solution and the Atlas4 uses what looks like a conventional 2.0:1 box with the 2.7 planetary gear bolted to the input side... like this:
That's basically a 5.44:1 overall ratio, with the intermediate choices of 1:1, 2.0:1 and 2.72:1..... and it looks to be a lot shorter in overall length than most other solutions.
Home-built creations are cool, but sometimes take FOREVER to complete. I have read for years about people wanting to mate two SM465 trannies to get "cheap" reduction, but when it comes down to actually doing it there are some expensive parts (the intermediate shaft) that prevent most people from ever completing it.
Anyway, I barely have time to work on my truck now as it is....so I just bought a packaged solution (the Atlas4). With only a 107" wheelbase, it's a nice compact solution too and should still give me decent driveshaft lengths and angularity.
The NWF BlackBox is one solution and the Atlas4 uses what looks like a conventional 2.0:1 box with the 2.7 planetary gear bolted to the input side... like this:
That's basically a 5.44:1 overall ratio, with the intermediate choices of 1:1, 2.0:1 and 2.72:1..... and it looks to be a lot shorter in overall length than most other solutions.
Home-built creations are cool, but sometimes take FOREVER to complete. I have read for years about people wanting to mate two SM465 trannies to get "cheap" reduction, but when it comes down to actually doing it there are some expensive parts (the intermediate shaft) that prevent most people from ever completing it.
Anyway, I barely have time to work on my truck now as it is....so I just bought a packaged solution (the Atlas4). With only a 107" wheelbase, it's a nice compact solution too and should still give me decent driveshaft lengths and angularity.
Greg72 said:Home-built creations are cool, but sometimes take FOREVER to complete. I have read for years about people wanting to mate two SM465 trannies to get "cheap" reduction, but when it comes down to actually doing it there are some expensive parts (the intermediate shaft) that prevent most people from ever completing it.
I'd still like to finish this, only problem is that I don't have a blazer and the intermediate shaft. It really wouldn't be the best doubler either. It would be too long unless you ran a 465 with a super short output. You'd need an adapter with a thickness of ~2.5-3.5 inches and a round pattern and a matching 27 or 32 spline output for the 465. if you had enough wheelbase (more than 125 inches), you could just use the 208's ouput shaft, which is 32 spline, to input to another 32 spline case (preferably a 205). But since this was going in a blazer, I couldn't do that, but still ended up with a doubler box that was ~10 inches or more long. which is about 3-4 inches longer than commercially available reduction boxes.
I'd love to help anyone else interested in making one.
big83chevy4x4
3/4 ton status
with mine, all i need to do is weld the case up and finish the adapter (cut it to length and weld the case back half to it). its kinda a lost cause though, im preaty sure im gonna break it with my new bbc.
