Removing Dana 20 from 4 speed gearbox - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CCCC · 10-11-2015, 05:27 PM

Need a bit of info/assistance with this dismantle - don't want to break anything.

Have removed the several flange bolts mounting the Dana 20 to the transmission but gentle prying will not break the transfer case loose from the transmission. Am thinking there must be some additional "attachment" aspect that must be addressed. Does the Tcase not simply slide over the spline of the 4 speed gearbox - is there an interference fit between the two boxes - or does a guy need to open the transmission and remove some pin or locking ring to release the Tcase.?

BTW, regarding the bracket that holds the Dana 20 4wd shifter (extends up alongside the gearbox) is it attached in any way to the gearbox?

Thanks for any info/assistance.

bmchevy1979 · 10-12-2015, 12:29 AM

Well I know a dana18 has a nut on the end of the trans output that holds the gear in trans and they are very similar cases other than the rear output so you might need to open case up andinspect before you do anymore prying

CCCC · 10-12-2015, 08:05 PM

Thanks Brandon - suspicions confirmed - will open the gearbox and llo for that or something similar.

10-11-2015, 05:27 PM	#1
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Removing Dana 20 from 4 speed gearbox Need a bit of info/assistance with this dismantle - don't want to break anything. Have removed the several flange bolts mounting the Dana 20 to the transmission but gentle prying will not break the transfer case loose from the transmission. Am thinking there must be some additional "attachment" aspect that must be addressed. Does the Tcase not simply slide over the spline of the 4 speed gearbox - is there an interference fit between the two boxes - or does a guy need to open the transmission and remove some pin or locking ring to release the Tcase.? BTW, regarding the bracket that holds the Dana 20 4wd shifter (extends up alongside the gearbox) is it attached in any way to the gearbox? Thanks for any info/assistance. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

10-12-2015, 12:29 AM	#2
bmchevy1979 Registered User Join Date: Dec 2010 Location: Visalia, Ca Posts: 707	Re: Removing Dana 20 from 4 speed gearbox Well I know a dana18 has a nut on the end of the trans output that holds the gear in trans and they are very similar cases other than the rear output so you might need to open case up andinspect before you do anymore prying __________________ <Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works. 1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195

10-12-2015, 08:05 PM	#3
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Re: Removing Dana 20 from 4 speed gearbox Thanks Brandon - suspicions confirmed - will open the gearbox and llo for that or something similar. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.