Looking at buying an 1986 Blazer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dmsteele92831 · 11-16-2007, 08:24 PM

I am looking at buying a 1986 Chevy Blazer 4 x 4 that I am told had the engine and tranny rebuilt about 10,000 miles ago (no paper work though). Is there some way I can tell or are there any things I should check for on these to make sure it's all good. It has a 350 engine with either a TH350 or TH400 tranny (he's not sure).

Thanks!

streetstar · 11-17-2007, 11:45 AM

Just some general things , are - how clean is it if you hose off the top layer of dust? an engine with 10k should be pretty clean, although if it has been sitting any length, it will be dusty. If it is handy to pull 1 valvecover, that would give you a little bit of an idea too -- it shouldnt have any sludge in it --- the performance should be good (maybe not fast, but consistent)

A TH350 trans has a suare pan with one corner cut off -- while a TH 400 trans pan is kind of like a kidney shape-- but definitely not square

dmsteele92831 · 11-17-2007, 12:57 PM

Cool thanks! I take it the TH400 is a better trans?

**Zoomad75** · 11-18-2007, 04:15 PM

Quote:

Originally Posted by dmsteele92831

Cool thanks! I take it the TH400 is a better trans?

The TH400 is a better trans, but it was never factory installed in a blazer with a small block. Only way you'd have one of those is if it was swapped in.

dmsteele92831 · 11-18-2007, 04:54 PM

What about the 700r4 (i know it's a 4 speed), did they come stock in any years?

**Zoomad75** · 11-18-2007, 05:33 PM

700r4's arent bad, but can be a little sensitive to larger tires if not gear correctly and beefed up accordingly. 700r4's started coming in the mid 80's. I can't remember the exact year, but again all you got to do is look at the shape of the pan.

It's possible that the 86 did have a 700 at one time and got swapped with a th350 or th400 due to the 700 failing. Look at the pan.

Igotachevyor2 · 11-20-2007, 11:33 AM

my 86 came with a 700r4

LonghornJeff · 11-25-2007, 09:24 PM

The main thing about that era blazers is rust ...but......here are the
specs for a 1986.
http://coloradok5.com/specs.shtml#1986

11-17-2007, 11:45 AM	#2
streetstar Registered User Join Date: May 2007 Location: Moore, Oklahoma Posts: 2,396	Re: Looking at buying an 1986 Blazer Just some general things , are - how clean is it if you hose off the top layer of dust? an engine with 10k should be pretty clean, although if it has been sitting any length, it will be dusty. If it is handy to pull 1 valvecover, that would give you a little bit of an idea too -- it shouldnt have any sludge in it --- the performance should be good (maybe not fast, but consistent) A TH350 trans has a suare pan with one corner cut off -- while a TH 400 trans pan is kind of like a kidney shape-- but definitely not square

11-17-2007, 12:57 PM	#3
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Looking at buying an 1986 Blazer Cool thanks! I take it the TH400 is a better trans? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

11-18-2007, 04:54 PM	#5
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Looking at buying an 1986 Blazer What about the 700r4 (i know it's a 4 speed), did they come stock in any years? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

11-18-2007, 05:33 PM	#6
Zoomad75 K5Camper Join Date: Mar 2004 Location: Pueblo, CO Posts: 1,513	Re: Looking at buying an 1986 Blazer 700r4's arent bad, but can be a little sensitive to larger tires if not gear correctly and beefed up accordingly. 700r4's started coming in the mid 80's. I can't remember the exact year, but again all you got to do is look at the shape of the pan. It's possible that the 86 did have a 700 at one time and got swapped with a th350 or th400 due to the 700 failing. Look at the pan. __________________ Rob Z. 1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP 1991 K5 8.1L/NV4500/241/D44/14b FWC Camper

11-20-2007, 11:33 AM	#7
Igotachevyor2 Apache Club Join Date: Jan 2006 Location: Goodlettsville,Tn. Posts: 1,294	Re: Looking at buying an 1986 Blazer my 86 came with a 700r4 __________________ 58 CHEVY APACHE I 74 CHEVY C-10 I 78 K-10 donor truck I 89 SONOMA My Trucks Apache Sitting Idle MySpace Project Dad's Truck (74 C-10 to K-10 conversion) .

11-16-2007, 08:24 PM	#1
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Looking at buying an 1986 Blazer I am looking at buying a 1986 Chevy Blazer 4 x 4 that I am told had the engine and tranny rebuilt about 10,000 miles ago (no paper work though). Is there some way I can tell or are there any things I should check for on these to make sure it's all good. It has a 350 engine with either a TH350 or TH400 tranny (he's not sure). Thanks! __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

11-25-2007, 09:24 PM	#8
LonghornJeff EZEKIEL 25:17 Join Date: Oct 2001 Location: Springfield IL USA Posts: 984	Re: Looking at buying an 1986 Blazer The main thing about that era blazers is rust ...but......here are the specs for a 1986. http://coloradok5.com/specs.shtml#1986 __________________ 68 CHEVELLE(HORSESHOE) 69 LONGHORN 396 70 NOVA 454(FOR SALE) 71 SWB 307 71 EL CAMINO 383 72 GMC JIMMY 350 87 BLAZER 350 WIW? http://blog.360.yahoo.com/blog-r5CJt...9_6Orzim4L5uWM Gun control, the theory that 110lb. women have the "right" to fistfight with 210lb. rapists. The reason animal rights activists are more passionate about fur than leather is because it's safer to harrass rich women than bikers...

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