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#343829 - Sat Dec 01 2007 11:05 PM T5 transmission
Todd M Offline
Wrench Fetcher
Registered: Tue May 16 2006 12:00 PM
Posts: 172
Loc: Hanover, PA
I am writing to see if anyone can tell me more about my transmission. I bought a T5 from a 2wd Chevy S10. Near as I can figure it is a 1989 model. There is a tag on it, but it is so thoroughly rusted that nothing can be read on it. Here is a picture:

T5 transmission

Here are some other numbers.

The case Basic 4 1352-065-916 cast Aug 88
The lid Basic 2A 1352-097-917 cast Aug 88
The tail housing 1352-066-931
Shifter plate 1352-598-044
Serial number on case CK2106112

I measured and calculated ratios to be:

1 4.00:1
2 2.38:1
3 1.48:1
4 1.00:1
5 0.86:1

On a chart Inliners T5 page I found some numbers. The chart shows ratios of 4.03, 2.37, 1.49, 1.00 and 0.86 for early S10 transmissions.

With the casting dates and the fact that I have an electrical connector for both the backup light and the electronic speedometer, I am guessing that I have a T5 from a 1989 2WD Chevy S10.

There are 2 model numbers that I have found. I think one of these is what was on the rusted tag.

1352-191 is a 1989 GM T-truck 4 cyl
1352-193 is a 1989 GM S-Truck 4 cyl

Can anybody tell me what a T-Truck is vs an S-Truck? Was the T-Truck the S10 Blazer?

I have figured out that it is a NWC (non-world-class) vs a WC (world class) transmission.

I found a table somewhere that listed the gear ratios in a 1989 S-10 and I just can't find it. However, they were completely different than what I have listed above.

Can anyone shed some light on this?

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#343834 - Sat Dec 01 2007 11:13 PM Re: T5 transmission [Re: Todd M]
LONGBOX55 Offline
Master Gabster
Registered: Mon May 08 2006 12:00 PM
Posts: 9095
Loc: DANVILLE IL
I can't really tell you much about the trans, but as to the "S" and "T" thing, the S truck/Blazer is the 2wd, T is the 4x4.
_________________________
Bill Burmeister
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#343860 - Sun Dec 02 2007 12:21 AM Re: T5 transmission [Re: LONGBOX55]
Fla54Chevy3100 Offline
Shop Shark
Registered: Tue Oct 04 2005 12:00 PM
Posts: 1411
Loc: Central Florida
The tag #1352-191 specs out to be a "Light truck" 4.03, 2.37, 1.49, 1.00 and a .72 5th gear. This came from:

http://www.ttcautomotive.com/English/products/T-5.asp

However, I find from another source that tag #1352-191 lists as a 3.76, 2.18, 1.41, 1.0, and .72 5th. This source also shows the same ratios from an S-truck for the 1352-193. I think these chart came from the Tremec site....doesn't have any url on my copies.

Dave


Edited by Fla54Chevy3100 (Sun Dec 02 2007 12:26 AM)
_________________________
Webshot "Tips and tricks" and "Shoebox" Photo Albums

EXPERIENCE is the best teacher...but it gives the test first...and the lesson afterwards.

"What this generation tolerates...the next will embrace"
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#343928 - Sun Dec 02 2007 11:23 AM Re: T5 transmission [Re: Fla54Chevy3100]
Wrenchbender Ret. Offline
Master Gabster
Registered: Sun Jun 20 2004 12:00 PM
Posts: 9185
Loc: Lenexa Ks.
I can,t tell from the photo but if it has the electronic speedo drive it is 88 up. This creates a problem if you are useing it in one of the older trucks. You have to use a custom gauge or a special converter. Or you have to change the rear houseing & speedo drive gear.
_________________________
If it ain't broke, sell it & buy one that is.


1956 Chevy 1/2-Ton Pickup

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#345463 - Thu Dec 06 2007 08:46 AM Re: T5 transmission [Re: Fla54Chevy3100]
Todd M Offline
Wrench Fetcher
Registered: Tue May 16 2006 12:00 PM
Posts: 172
Loc: Hanover, PA
Thanks for the info. Fla54Chevy3100, the table was great. It looks like I might have either a 1352-000-216 or 1352-000-257. Is there any way to figure out what year they were produced? Mine says Borg Warner on the case. I know that Tremec took over production at one point and may have either used the Borg Warner cases or had part numbers for overlapping production. My guess is that that lower number (216) makes most sense.

Thanks again to everyone for the help.
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#345474 - Thu Dec 06 2007 09:28 AM Re: T5 transmission [Re: Todd M]
Fla54Chevy3100 Offline
Shop Shark
Registered: Tue Oct 04 2005 12:00 PM
Posts: 1411
Loc: Central Florida
Todd, a tag 1352-216 indicates a 93 S10 behind a 2.2L while a tag 1352-257 is from a late model Nissan 4wd w/transfer case. Doubt that you have one of those!!! A 93 s10 will have an electronic speedo setup....on page 10 of my Webshots "shoebox" I have pictures of both the mechanical and electronic setups.

I wouldn't discount an electronic setup....granted, the converter box @ $300 is pricey, but so is rebuilding an older high-mileage T5 with a mechanical speedo. You might get lucky and get a T5 that is in better shape internally.

Dave
_________________________
Webshot "Tips and tricks" and "Shoebox" Photo Albums

EXPERIENCE is the best teacher...but it gives the test first...and the lesson afterwards.

"What this generation tolerates...the next will embrace"
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#346167 - Fri Dec 07 2007 10:52 PM Re: T5 transmission [Re: Fla54Chevy3100]
Todd M Offline
Wrench Fetcher
Registered: Tue May 16 2006 12:00 PM
Posts: 172
Loc: Hanover, PA
Dave,

I am not too concerned that mine is the electronic speedo. My gages would need totally rebuilt or replaced anyhow. I may just buy aftermarket electronic gages as I would like to have a tachometer as well. I really suspect that I have a 1989 T-5 because it has the Aug 1988 casting date on two of the parts. It just seems that from the information I have seen, the 1989 S-10 2WD T-5 did not seem to come with the .86 5th gear that I seem to have. I am going to try to calculate it out again, but that is what I get so far. I will eventually take it to a shop to haveit looked over and maybe have the synchros replaced. I will check the number of teeth on the gears as well. That should give me an accurate calculation.

I saw how you modified the splines in the T-5. I assume that you cut back on the outer collar as well. It covers up part of the splins on mine. I am going to try to use the Vega hub / Astro Van clutch disk combo. That may negate the need to extend the spline grooves.

What rear end ratio did you end up with? I had been thinking aobut 3.55 gears. I bought a 12-bolt posi, but it has 2.73 gears. (Too tall) If I really do have the .86 overdrive, I might be better off with something like the 3.42 gear.

Did you have any concern of axle tube warpage when welding on your spring perches?

What size tires are you running. I am 90% planning to buy the Jim Meyers IFS with a manual steering rack. On another thread it was suggested that I shouldn't use a tire wider than 215. I would like to use a 225 or 235 tire on all four corners, but am concerned about the steering. I guess I should get around to callin Jim Meyers and asking what they think.
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#346250 - Sat Dec 08 2007 09:05 AM Re: T5 transmission [Re: Todd M]
Wrenchbender Ret. Offline
Master Gabster
Registered: Sun Jun 20 2004 12:00 PM
Posts: 9185
Loc: Lenexa Ks.
The chart I use shows all 88-89 S-10s as haveing 3.76 first & 0.72 fifth.
_________________________
If it ain't broke, sell it & buy one that is.


1956 Chevy 1/2-Ton Pickup

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#346252 - Sat Dec 08 2007 09:09 AM Re: T5 transmission [Re: Todd M]
Fla54Chevy3100 Offline
Shop Shark
Registered: Tue Oct 04 2005 12:00 PM
Posts: 1411
Loc: Central Florida
Hi Todd,

There are 2 common S10 OD ratios in the NWC T5's, the .72 and .86. I found the easiest way to differentiate was to put the transmission in 5th gear, mark both the input and output shaft at the 12:00 position. Rotate the OUTPUT shaft (rear) 360 degrees and observe the position of the mark on the input (front) shaft. If the input shaft has rotated less than 270 degrees your ratio is more than likely .72, if it's rotated more than 270 degrees it's more than likely .86. Not an exact science by any means, but able to be done at the j-yard before you pay for the box.

Based on what I'm running....the .72 OD, 3.42 R&P, and a 28.5" tall rear tire. Most of my driving is either around town or on the 4 lane...not much 55 mph stuff. First through fourth are great in town...you don't stay in 1st gear long even with the 3.76 ratio and you can putz around at 35 mph in 4th with no lugging. OD for my 70 mph cruise has me spinning a conservative 2000 rpm's and have no problem dropping down to 45-50 and accelerating with traffic. Fourth gear at 70 mph is well under 3000 rpms.

I'm very happy with my Camaro 3.42....tried the 3.08 but it was way too tall for the .72. You'll just have to run the numbers, keeping in mind that the 235 sweet spot is between 1700 and 2400 rpms for a basically stock engine. I think I mentioned before that a 3.73 might be a viable alternative with a .72 if you lived in the hills/mountains or were wanting to pull a trailer.

As for axle tube warpage, I used a stick welder, ran short beads and used a wet towel to control the heat. I've noted no problems.

I used 255/70/15's on 5 lug 4-3/4" pattern 15X8 with 4" backspacing (62" wide Camaro diff) and 235/70/15's on 15X7 with 4" BS on the front. I have no clearance issues but would recommend 235/70/15's on 15X7 with 4" BS all the way around. This would allow you to rotate your tires and give you a more level stance. BTW...the 15" rims clear the front 5 lug disc conversion and tie rod ends with room to spare.

As for the steering, I am still running the stock steering box, 18" steering wheel, and 32 psi tire pressure. Power steering (Toyota) is down the road. I also lube every 1000 miles.

Hope this helps.

Dave
_________________________
Webshot "Tips and tricks" and "Shoebox" Photo Albums

EXPERIENCE is the best teacher...but it gives the test first...and the lesson afterwards.

"What this generation tolerates...the next will embrace"
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#346484 - Sat Dec 08 2007 09:03 PM Re: T5 transmission [Re: Fla54Chevy3100]
Todd M Offline
Wrench Fetcher
Registered: Tue May 16 2006 12:00 PM
Posts: 172
Loc: Hanover, PA
Wrenchbender,

That is what is confusing to me. I don't know if castings made in August of 1988 could have been used in 1990 or later transmissions.

I will have to go and check the rotation in 5th gear again.

Dave,

Thanks for all the info. I agree that I would like to use the same size tires all around. With my planned use of the rack & pinion steering, I will have less turns lock-to-lock and thus less leverage to turn the tires. I don't know if anyone elase here has had experience. Like I said I have had one person tell me that 215 would be the max width, but I would rather have a 225 or 235 width and don't know if that will necessitate power steering. I am using a 235 6-cylinder and not a small block so it might be complicated to add power steering.
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