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02-05-2019, 10:22 PM | #1 |
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Location: Richland, WA
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Convert Allison 2 wheel drive into 4x4
Hello,
I am planning on putting a Chevy 8.1L into my 76 K20. The Engine/trans combo that I have available has a Allison 2 wheel drive that I would like to convert to 4 wheel drive. Has anyone else done this? Thoughts on the conversion? Computer, difficulty? What about the transfer case? Thank you. |
02-06-2019, 12:19 AM | #2 |
Post Whore
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Location: Alabama
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Re: Convert Allison 2 wheel drive into 4x4
its been done..just google (Allison transmission 2wd to 4wd) sounds like just change out the tailshaft housing...parts aint cheap and that's a big ol transmission...
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
02-06-2019, 11:07 AM | #3 |
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Re: Convert Allison 2 wheel drive into 4x4
Thank you Greg.
I had planned on building a 496 but that didn't work out. I can get a low mile 8.1 with allison 2wd for a reasonable price. Cheaper than building the 454 into a 496. I want to run a camper and sometimes pull my boat. Looking for a "draft horse" type setup. Dan |
02-06-2019, 11:59 AM | #4 |
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Join Date: May 2012
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Re: Convert Allison 2 wheel drive into 4x4
make sure you research the electronics side of it and the t-case you want to use to see if the computer can even be setup for the low range ratio .
the few guys i have read up on said in the end they wished they had left it 2wd control and used the t-case as its self , or did a divorced case if you have the wheel base length for that .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
02-07-2019, 01:23 AM | #5 |
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Join Date: Dec 2012
Location: Temple City
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Re: Convert Allison 2 wheel drive into 4x4
I think it can be adapted to a 205 which is what I would do on any bigger motor,.
Got me wrong I like the 208 or 241 for a revvy small block where the lower gear works nicer. |
02-07-2019, 02:14 AM | #6 |
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Join Date: Mar 2003
Location: Colfax-California
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Re: Convert Allison 2 wheel drive into 4x4
Install a divorced t-case.
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02-10-2019, 11:22 PM | #7 |
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Join Date: Mar 2007
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Re: Convert Allison 2 wheel drive into 4x4
email chuck at ORD, he can make it work with a stub shaft and spacer, that's what I'm looking at for my NP203/205 doubler to allison setup I'm planning.
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'06 2500 HD 4x4. manual transfer case, crank windows. '88 V10 Suburban 4x4,"The Pig Rig" L05, 700r4, NP208, 4x4 beater camper fun truck project. My trucks don't leak oil, they mark their territory. |
02-10-2019, 11:50 PM | #8 |
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Re: Convert Allison 2 wheel drive into 4x4
Guy on ck5 did a ord magnum kit for Allison to 205 but running vss in 205 makes stock ECM not happy with doubler ratios .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
02-10-2019, 11:56 PM | #9 |
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Re: Convert Allison 2 wheel drive into 4x4
Saw some of the ck5write up. Anxious to talk to ord as the stuff they offer is amazing! Not worked with them before. Thank you.
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02-11-2019, 11:28 AM | #10 |
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Re: Convert Allison 2 wheel drive into 4x4
been ordering from them for years . 15+ now . . . .currently waiting for the 9am open to order more today .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
02-11-2019, 12:21 PM | #11 |
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Re: Convert Allison 2 wheel drive into 4x4
Just emailed. Looks like they have some amazing parts. I am really interested i their lift kits. Very complete and a great deal of experience/knowledge there.
Thank you. |
02-15-2019, 04:39 PM | #12 |
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Convert Allison 1000 5sp 2wd into 4wd
Hello,
I am planning on putting a 2003 Chevy 8.1L into my 76 K20. The Engine/trans combo that I have available has a Allison 1000 2wd that I would like to convert to 4wd. Has anyone else done this? Thoughts on the conversion? Computer, difficulty? What about the transfer case? I am thinking NP 241 (Manual shift) due to the availability and electronics. Thoughts? Thank you. |
02-17-2019, 01:07 PM | #13 |
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Location: Central Coast California
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Re: Convert Allison 1000 5sp 2wd into 4wd
I used an Allison 2wd and connected it to a divorced np205. I had to have an intermediate drive shaft made up. I'm not sure it's any cheaper to do it that way...
I can't remember the computer stuff. I never drove the setup and dont know what issues with the computer/speedo came about. Wil
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263 |
02-17-2019, 05:50 PM | #14 | |
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Re: Convert Allison 1000 5sp 2wd into 4wd
That's interesting.
Does the divorced case cause any clearance issues? I asked for and got the driveline with the engine/trans from the wrecking yard. It's a 2 piece. Dan Quote:
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02-18-2019, 02:09 AM | #15 | |
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Location: Central Coast California
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Re: Convert Allison 1000 5sp 2wd into 4wd
Quote:
Not from the divorced case. The Allison was huge and I had a body lift to clear the tunnel. I had a 3" body lift but iirc I could gotten away with 1" - 2". (I had to have the body lift because of the frame I was using and what I was trying to accomplish.) Wil Sorry, i can't find the pic of the intermediate shaft setup. I do have a pic of a cutting brake set up on the back of the np205, btw.
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263 |
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02-18-2019, 02:15 AM | #16 |
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Re: Convert Allison 1000 5sp 2wd into 4wd
You do have to work your angles, though. i.e.trans to divorced case and div case to rear and front pinions. The trans to divorced case has to have at least some angle to keep the u-joints greased. (So I've read online.)
You need to keep your angles appropriate and have the right cardan joints, etc., to keep the vibrations down and keep from wearing out u-joints. At least, that's the research I did....not sure I did it right. I sold the truck before I ever drove her. Wil
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263 |
02-18-2019, 02:53 AM | #17 |
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Re: Convert Allison 1000 5sp 2wd into 4wd
Would have been nice to see that truck run down the road. Just the other day I was thinking about that.
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02-18-2019, 01:35 PM | #18 |
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Location: Central Coast California
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Re: Convert Allison 1000 5sp 2wd into 4wd
I hear you.
I was just so tired. New baby, new business, no time and a garage that was packed with trucks and parts.
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263 |
02-19-2019, 12:30 PM | #19 |
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Re: Convert Allison 1000 5sp 2wd into 4wd
if you decide to convert the 2wd allison to 4wd then you must stand the trans up tall on its bellhousing and remove the tailshaft that way, if you remove the tailshaft housing and reinstall the new one with the trans laying down on its pan you have an extremely high chance of messing up the bearing in the back and you will not know it until it is too late and you ruin the trans.
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