2wd trans in a 4wd - The 1947 - Present Chevrolet & GMC Truck Message Board Network

manimal · 02-02-2007, 10:20 AM

Has anybody used Advanced Adapters trans to transfer case mount for putting a 2wd trans into a 4x4? I have 2 th400's and want to use one in my truck (avatar) but they are 2wd's.I called AA and they said it would be about 600 bones for the conversion kit. And so far all the local ads for 4x4 th400's are INSANE! Any suggestions?

**kwmech** · 02-02-2007, 11:08 AM

You can use the 2x trans with a 205 t-case and the factory adaptor. Just double check the depth of the splines, some of the input gears of the 205 are not deep enough and you may have to trim about 5/8'' off the splines of the trans.

**71blksuper4x4** · 02-02-2007, 12:34 PM

You could also try to find a divorced 205 Transfer Case with a small driveshaft in between.... You have to modify the shifter to fit in stock by building a longer bracket.... but you could make that work if needed as well... and should be cheaper than 600 bones. This would be good if you wheel your truck at all.... you can set the front and the back driveshafts to be the same length... thus you break the rear driveshaft... replace it with the front to get home. Trevor

CrashEd · 02-02-2007, 02:41 PM

Have one rebuilt with the short 4x4 center shaft. i have changed center shaft and leave the tail shaft housing off and its a 4x4 trans. but the easiest way and to start fresh is to just buy the shaft and have it rebuilt with the shorter center shaft.

Ed

gator2511 · 02-02-2007, 06:01 PM

I used the AA kit to install a TH400 in my 72 with a np205 tc. The kit comes with a larger input gear and bearing for the TH400 tranny. You need to have the tc machined for the new gear. Its a lot of money but it works great. The Th350 or manual input shaft on the np205 won't work on a TH400. I used the short shaft 2wd TH400 and just removed the tailshaft housing. It bolts right up to the adapter.

b454rat · 02-02-2007, 06:27 PM

I have a 2wd 400 in my 89, using a Ford 205 case, and adaptor for a 208/241. I swapped the t-case input with a GM one from an 86. Member on CK5 had a spacer made so you can mate the two together, let me borrow it so I could get one made. The GM and Ford 6 bolt pattern LOOK the same, but they are not. 2 holes are slightly off. What the spacer does it take up the extra shaft length, clock the case, and proper spacing on the bolt holes. So, you can get a spacer made that goes between the case and adaptor.

02-02-2007, 10:20 AM	#1
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	2wd trans in a 4wd Has anybody used Advanced Adapters trans to transfer case mount for putting a 2wd trans into a 4x4? I have 2 th400's and want to use one in my truck (avatar) but they are 2wd's.I called AA and they said it would be about 600 bones for the conversion kit. And so far all the local ads for 4x4 th400's are INSANE! Any suggestions?

02-02-2007, 11:08 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,592	Re: 2wd trans in a 4wd You can use the 2x trans with a 205 t-case and the factory adaptor. Just double check the depth of the splines, some of the input gears of the 205 are not deep enough and you may have to trim about 5/8'' off the splines of the trans.

02-02-2007, 12:34 PM	#3
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,155	Re: 2wd trans in a 4wd You could also try to find a divorced 205 Transfer Case with a small driveshaft in between.... You have to modify the shifter to fit in stock by building a longer bracket.... but you could make that work if needed as well... and should be cheaper than 600 bones. This would be good if you wheel your truck at all.... you can set the front and the back driveshafts to be the same length... thus you break the rear driveshaft... replace it with the front to get home. Trevor __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever

02-02-2007, 02:41 PM	#4
CrashEd 72 chevy Join Date: Jan 2007 Location: Central Il Posts: 725	Re: 2wd trans in a 4wd Have one rebuilt with the short 4x4 center shaft. i have changed center shaft and leave the tail shaft housing off and its a 4x4 trans. but the easiest way and to start fresh is to just buy the shaft and have it rebuilt with the shorter center shaft. Ed Last edited by CrashEd; 02-02-2007 at 02:44 PM.

02-02-2007, 06:01 PM	#5
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Re: 2wd trans in a 4wd I used the AA kit to install a TH400 in my 72 with a np205 tc. The kit comes with a larger input gear and bearing for the TH400 tranny. You need to have the tc machined for the new gear. Its a lot of money but it works great. The Th350 or manual input shaft on the np205 won't work on a TH400. I used the short shaft 2wd TH400 and just removed the tailshaft housing. It bolts right up to the adapter. Last edited by gator2511; 02-02-2007 at 06:04 PM.

02-02-2007, 06:27 PM	#6
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,464	Re: 2wd trans in a 4wd I have a 2wd 400 in my 89, using a Ford 205 case, and adaptor for a 208/241. I swapped the t-case input with a GM one from an 86. Member on CK5 had a spacer made so you can mate the two together, let me borrow it so I could get one made. The GM and Ford 6 bolt pattern LOOK the same, but they are not. 2 holes are slightly off. What the spacer does it take up the extra shaft length, clock the case, and proper spacing on the bolt holes. So, you can get a spacer made that goes between the case and adaptor. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS



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