How much will a T-90 handle - Pirate4x4.Com : 4x4 and Off-Road Forum

VermontCJ3a · 01-24-2012, 01:49 PM

I'm wondering how much horsepower i can run through a T-90 transmission without looking to rebuild it very time i go out. The reason I ask is because I want to run a 2.3 turbo motor with my t-90 and they make roughly 180hp with no modification. Thanks

strvger · 01-24-2012, 03:20 PM

you should be fine if you drive it right. the old t-90's were never known for their 'speed shifting' abilities. that being said, your 2.3 will be putting out just a bit more than the old jeep v6 did.

VermontCJ3a · 01-24-2012, 03:39 PM

Alright thanks

CRO · 01-26-2012, 07:58 PM

in an earlier incarnation of my Willys I had a 22re Toyota with a 4speed toyota Transmission running to a T90/spicer 18, I used the T90 as a Two speed range box...I broke transfercases mostly due to crappy Crown Automotive parts but never broke transmission internals.

VermontCJ3a · 02-09-2012, 06:57 AM

well I how with a good rebuild and the change of gearing in my t-90 that this will handle the 200 hp that this motor will be putting out. Also has anyone adapted the dana 20 transfer case to the t-90 from what I'm finding its not just a simple swap you have to mill relief spots in the case to get them to mount right and buy the barring adapter. But I will take some pictures of this to show people what I mean

Peow130 · 02-09-2012, 01:00 PM

I'm pretty sure you can put the d18 internals into the d20 case and it bolts up.
That's just what i read though

Mieser · 02-09-2012, 01:40 PM

Are you going to do a compete dana 20 with a centered rear output?

The case is the same as the D18, but the bore on the front of the case is larger than most D18 cases, especially early ones.

I am not sure if there are any differences in how the rear output bolts to the T90 output shaft. Most adapter packages let you use either case, so I think it should work....

VermontCJ3a · 02-09-2012, 06:17 PM

Well Im using the dana 20 case for the center output on the rear and I'm using the dana 18 gears with the bronco sliding gear to give the dana 20 the low ratio of the dana 18

Peow130 · 02-09-2012, 06:36 PM

Did you get a centered-diff rear axle, then?
Or are you going to run the offset one and replace the u-joints often?

VermontCJ3a · 02-11-2012, 02:37 PM

Running a center mounted dana 44 rear axle

01-24-2012, 01:49 PM	#1 (permalink)
VermontCJ3a Registered User Join Date: Aug 2011 Member # 196310 Location: Readsvegas, Vermont Posts: 73	How much will a T-90 handle I'm wondering how much horsepower i can run through a T-90 transmission without looking to rebuild it very time i go out. The reason I ask is because I want to run a 2.3 turbo motor with my t-90 and they make roughly 180hp with no modification. Thanks

01-26-2012, 07:58 PM	#4 (permalink)
CRO Registered User Join Date: Oct 2001 Member # 7588 Location: Beautiful B.C. Canada Posts: 856	in an earlier incarnation of my Willys I had a 22re Toyota with a 4speed toyota Transmission running to a T90/spicer 18, I used the T90 as a Two speed range box...I broke transfercases mostly due to crappy Crown Automotive parts but never broke transmission internals. __________________ 1948 Willys 1952 M37CDN Powag

02-09-2012, 01:00 PM	#6 (permalink)
Peow130 Registered User Join Date: Nov 2008 Member # 123919 Location: Spokane, WA Posts: 717	I'm pretty sure you can put the d18 internals into the d20 case and it bolts up. That's just what i read though __________________ 98 Tacoma. Chick paintjob and 33's 51' CJ3A/CJV35-U SBF289, Disk swap, SOA, 3speed

02-09-2012, 01:40 PM	#7 (permalink)
Mieser Registered User Join Date: Jun 2001 Member # 5326 Location: Southwest Colorado Posts: 3,888	Are you going to do a compete dana 20 with a centered rear output? The case is the same as the D18, but the bore on the front of the case is larger than most D18 cases, especially early ones. I am not sure if there are any differences in how the rear output bolts to the T90 output shaft. Most adapter packages let you use either case, so I think it should work.... __________________ 42 MB, 225, T18, big kid go cart with clown tires 92 Dodge W250 daily driver on 39s

02-09-2012, 06:36 PM	#9 (permalink)
Peow130 Registered User Join Date: Nov 2008 Member # 123919 Location: Spokane, WA Posts: 717	Did you get a centered-diff rear axle, then? Or are you going to run the offset one and replace the u-joints often? __________________ 98 Tacoma. Chick paintjob and 33's 51' CJ3A/CJV35-U SBF289, Disk swap, SOA, 3speed

01-24-2012, 03:20 PM	#2 (permalink)
strvger Registered User Join Date: Nov 2011 Member # 202759 Location: land of 2 seasons: winter and getting ready for winter Posts: 169	you should be fine if you drive it right. the old t-90's were never known for their 'speed shifting' abilities. that being said, your 2.3 will be putting out just a bit more than the old jeep v6 did.

01-24-2012, 03:39 PM	#3 (permalink)
VermontCJ3a Registered User Join Date: Aug 2011 Member # 196310 Location: Readsvegas, Vermont Posts: 73	Alright thanks

02-09-2012, 06:57 AM	#5 (permalink)
VermontCJ3a Registered User Join Date: Aug 2011 Member # 196310 Location: Readsvegas, Vermont Posts: 73	well I how with a good rebuild and the change of gearing in my t-90 that this will handle the 200 hp that this motor will be putting out. Also has anyone adapted the dana 20 transfer case to the t-90 from what I'm finding its not just a simple swap you have to mill relief spots in the case to get them to mount right and buy the barring adapter. But I will take some pictures of this to show people what I mean

02-09-2012, 06:17 PM	#8 (permalink)
VermontCJ3a Registered User Join Date: Aug 2011 Member # 196310 Location: Readsvegas, Vermont Posts: 73	Well Im using the dana 20 case for the center output on the rear and I'm using the dana 18 gears with the bronco sliding gear to give the dana 20 the low ratio of the dana 18

02-11-2012, 02:37 PM	#10 (permalink)
VermontCJ3a Registered User Join Date: Aug 2011 Member # 196310 Location: Readsvegas, Vermont Posts: 73	Running a center mounted dana 44 rear axle

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