87 K20 208 case will 700R4 swap 400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**HOTFUN** · 03-10-2009, 03:43 PM

I'm new to this later stuff but I have a 1987 V20 pickup with the C6P 8600 gvw chassis. My 87 GM order book in one part shows it was optional to get a MXO overdrive automatic with the 208 tc. It shows it not available with the 30 series 4x4 with the 205 case. So what do I need to convert my MX1 turbo 400 to the OD MX1? The dealer thought the transfer case was different?

sierra4x4 · 03-10-2009, 05:13 PM

Th350 and 700r4 use the 27 spline input 208
Th400 and Sm465 use the 32 spline input 208

**HOTFUN** · 03-11-2009, 12:27 AM

So do they make a 32 spline input shaft for the 700R4 tranny and does the 700R4 stay the same length and bolt right in here?
Can a 700R4 and T case from a Blazer or 10 series pickup bolt up? Any good website thread to explain this?
Thanks for the info.
Mark

03-10-2009, 03:43 PM	#1
HOTFUN Senior Member Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,144	87 K20 208 case will 700R4 swap 400 I'm new to this later stuff but I have a 1987 V20 pickup with the C6P 8600 gvw chassis. My 87 GM order book in one part shows it was optional to get a MXO overdrive automatic with the 208 tc. It shows it not available with the 30 series 4x4 with the 205 case. So what do I need to convert my MX1 turbo 400 to the OD MX1? The dealer thought the transfer case was different? __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

03-10-2009, 05:13 PM	#2
sierra4x4 Registered User Join Date: Jan 2009 Location: Canada Posts: 308	Re: 87 K20 208 case will 700R4 swap 400 Th350 and 700r4 use the 27 spline input 208 Th400 and Sm465 use the 32 spline input 208

03-11-2009, 12:27 AM	#3
HOTFUN Senior Member Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,144	Re: 87 K20 208 case will 700R4 swap 400 So do they make a 32 spline input shaft for the 700R4 tranny and does the 700R4 stay the same length and bolt right in here? Can a 700R4 and T case from a Blazer or 10 series pickup bolt up? Any good website thread to explain this? Thanks for the info. Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"



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