454 swap in my 79 cj7 - JeepForum.com
 
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post #1 of 11 Old 12-16-2009, 07:46 PM Thread Starter
wolfman1981
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1979 CJ7 
 
Join Date: Oct 2009
Location: virginia
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454 swap in my 79 cj7

tryin to figure out if i need a adapter plate for bellhousing to bolt to a t18 borg woerner trans

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post #2 of 11 Old 12-16-2009, 11:03 PM
bigjoe
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1977 CJ7 
 
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Not sure, you could try checking with Novak or maybe Advanced Adapters.

Seems like everyday is a Monday.

77' CJ-7 83' Chevy K10
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post #3 of 11 Old 12-17-2009, 01:08 AM
jumbojeepman
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1976 CJ7 
 
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I'm willing to bet yes, should be the same adapter as a small block chevy, though.
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post #4 of 11 Old 12-17-2009, 11:49 AM
BlueOvalBud
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1976 CJ8 
 
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You're going to find a SM465 you're best choice for your application.
Read this - Adapting Ford Transmissions to GM Engines
Yes, it's possible to bolt a Ford T18 to a GM bellhousing, but it requires bellhouing machining, some transmission case modifications, and you'll still need to get an adapter for the transfer case. Those costs add up.
SM465 is a GM 4 speed, pretty much the same as a T18. It's a four speed with granny low and PTO ports on both sides of the case.
SM465 Ratios: 6.5, 3.6, 1.6, 1:1 Direct
Since the Muncie SM465 is a GM transmission, it will bolt up directly to your bellhousing...totally eliminating extra machine-shop expenses. They're cheap, plentiful, and really strong. You'll find them in Chevy and GM trucks from the 70's through the 90's. The GM Muncie SM465 Transmission - Novak Conversions
Is the 454 going into the '79 listed under your name?
If so, you've got a Dana 20 right now.
Now is the time to decide if you want to keep the Dana 20 or get a Dana 300. I have experience with both transfer cases in my Jeeps. The big differences inclue shifting, length, and low range.
Dana 20 "can" be a bear to shift (learn to finesse and you'll get over that though), it is shorter than the Dana 300 (better driveshaft angles), but only has a 2:1 low range.
Dana 300 is a LOT easier to shift, is longer (creating steeper driveshaft angles), has a desirable 2.6 low range, and has a lot more aftermarket support.
Strength wise, I'm not sure which is better. But, they'll both survive behind big block. Axles will snap before you encounter t-case issues.
SM465/Dana 20 adapter - Adapting the SM465 to Dana 18 & 20 Transfer Cases
SM465/Dana 300 adapter - Adapting the SM465 to the Jeep Dana 300 Transfer Case

If you can't tell....Novak has an EXCELLENT website

Scrambler - a Nuttin' Special Budget Build from the ground up. '76 CJ7 Drivetain in a Scrambler. 258, T18, Dana 20, Dana 30, AMC 20, Fiberglass Tub, Team Rush, Glasspack
'84 CJ7 - A frame-off resto for my sister's daily driver! 258, T4, D300, D30, AMC 20, Widetracks
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post #5 of 11 Old 12-17-2009, 12:29 PM
1986cj
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what is the stick out length of your T18?
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post #6 of 11 Old 12-18-2009, 04:27 PM Thread Starter
wolfman1981
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Join Date: Oct 2009
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yes is going in my 79 cj7 its either put the 454 or ive been looking into rebuilding my 304 and punching it out to make it a detuned stroker if possible
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post #7 of 11 Old 12-18-2009, 06:50 PM
BlueOvalBud
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I'm not too much help in the engine department-
But, sounds like you're set on a granny-gear bulletproof 4 speed.

The AMC Bellhousings found in Pre-'79 CJ's that had a T150, T18, or T176 have the Ford 4 Speed bolt pattern. So, you can bolt either a T18, T19, or NP435 up to the AMC engine with THAT bellhousing. This is easy with NO machine-work modifications.

AMC Bellhousings found in post-'80 with the T4, T5, SR4 CAN be modified to accept GM 4 speeds. There's machine-work involved. This would be your last option, I think.
Adapting the SM465 Transmission to AMC Jeep Engines

The GM bellhousing behind a 454 will obviously accept GM 4 speeds. SM465 or SM420, although the SM465 i preferred because it's newer and more readily available. This is a no-mod bolt up situation on the bellhousing side.

No matter which way you go, you'll need a transmission-to-transfer case adapter.

My feelings-
If you go with an AMC powerplant, grab a pre-'79 bellhousing, get a Ford 4 speed, and get the transmission-to-transfer case adapter from Novak.

If you go with a GM powerplant, grab an SM465 out of a GM truck, and get the transmission-to-transfer case adapter from Novak.

Now's the time to decide if you want to stick with the Dana 20 or go with a Dana 300. What do you plan to do with your Jeep? What kind of gearing are you planning? Stock axles?

Scrambler - a Nuttin' Special Budget Build from the ground up. '76 CJ7 Drivetain in a Scrambler. 258, T18, Dana 20, Dana 30, AMC 20, Fiberglass Tub, Team Rush, Glasspack
'84 CJ7 - A frame-off resto for my sister's daily driver! 258, T4, D300, D30, AMC 20, Widetracks
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post #8 of 11 Old 12-18-2009, 09:38 PM Thread Starter
wolfman1981
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Join Date: Oct 2009
Location: virginia
Posts: 13
its got the original transmission and transfer case its a t18 borg woerner tranny 4 speed bulldog the jeep is basically all stock right now im looking into a set of dana 60 axles for the front and back and a locker for both
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post #9 of 11 Old 12-18-2009, 10:40 PM
JeepnBlake
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Drop an AMC 360 in it and be done with it.

Saves you a ton of cash, no adapters, engine is a bolt in, and should cost less than a rebuild.
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post #10 of 11 Old 12-19-2009, 07:24 AM
ThisGuyUKnow
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or get a 360 and stroke it
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post #11 of 11 Old 12-19-2009, 05:44 PM
BlueOvalBud
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Have you confired if your T18 has a granny gear? Earlier, I didn't mention that stock CJ's also came with a CLOSE RATIO T18.
This has undesirable gear ratios.
On the plus side, it has a usable drivers side PTO port, and has the same unbreakable stength as a regular granny-gear T18.

Close Ratio T18 ratios- 4, 2.4, 1.4, 1:1 Direct

If you have this close ratio T18 version, don't worry about strength. We've got this close ratio T18 in our Scrambler. We don't do crazy trails or rock crawing. Usually just backroad roads and occasional light trails. Twice, we've gotten a little crazy with it, and the Jeep NEVER gave us attitude. Once was pulling a 150' hedge of hemlock shrubs. The Jeep was hoppin' all 4 tires a foot off the ground yanking them out! That was done in second gear/4wd High. The second time was pulling my Ford one-ton out of the mud. The 6500 pound truck was loaded with dirt, adding another 4,000 pounds, bring the truck to around 10,500 pounds. Add the detail that the truck was buried and both axles were dragging. The Jeep was once again hoppin' all 4 a foot off the ground. "The Little Jeep That Could" yanked the truck out!

We have a fiberglass body, so the Jeep is VERY lightweight. We find second gear in high range is still low for our uses. We start off all the time in second. 1st gear/4 low is really unstoppable due to the power-to-weight ratio. I have a NP435 in my one-ton. So, I know what granny gears are all about.

Don't worry if it IS a close ratio, there's some reading to re-assure your doubts.

Scrambler - a Nuttin' Special Budget Build from the ground up. '76 CJ7 Drivetain in a Scrambler. 258, T18, Dana 20, Dana 30, AMC 20, Fiberglass Tub, Team Rush, Glasspack
'84 CJ7 - A frame-off resto for my sister's daily driver! 258, T4, D300, D30, AMC 20, Widetracks
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