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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 03-22-2006, 01:20 PM   #1 (permalink)
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7.3IDI to T18

I asked this question about a year ago. I have a 79 F-250 w/ a T18 4-spd trans. The motor that came out of it was a 400 gas. I am putting in a '90 7.3 IDI.
I just talked to a local transmission guy who said the IDI bellhousing pattern is the same as a big block (460) and that my bellhousing may fit right up. Any ideas on this?
Also, any suggestions on a clutch?
I'm finally at the point where I can get moving on this project, and am very excited. Thanks!
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1979 F-250 Ranger 4x4. Dana 60 front and rear, 3.53 gears. T-18, NP205. Future show truck with 7.3 IDI.
1999 F-250 Super Duty 4x4. 7.3 PowerStroke, 3.73 gears, 6-spd manual.
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Old 03-22-2006, 01:56 PM   #2 (permalink)
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Re: 7.3IDI to T18

I don't believe it will bolt up. However you can remove your existing bellhousing and bolt on a diesel bellhousing (6.9 or 7.3 IDI). You will also need the steel adaptor plate that goes between the engine and bellhousing that the starter bolts to.

The 460 / diesel bellhousing issue is interesting. As I understand it, on some transmissions the bellhousings are the same, however holes are drilled in different spots for the different engines. Someone on here made a jig to drill the different holes, not sure which trans it was.

Also, if your transmission has the "grannie" first gear, you might want to swap to a diesel trans which would have a higher, more useable first gear.

I gotta say the 73 - 79 Fords were wonderful trucks and I commend what you are doing.
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1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

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Old 03-22-2006, 06:41 PM   #3 (permalink)
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Re: 7.3IDI to T18

I dont know where to post this but here goes. I put a 460 in my 91 f350 with the idi zf5. The shape of the housing is the same big block and diesel, the top 2 holes are very close, that is it. The other 4 and the dowel holes are not even close, there are no starter bolt holes in the diesel zf5. I made some plates to drill it to fit my 460 and I have had 50k troublefree miles. I am putting in the 7.3 as soon as i get it done, fuel mileage with a very built 460 is nonexistent, [img]/ubbthreads/images/graemlins/eek.gif[/img] But let me tell you it sure is fun to run off and leave some of these ricers with a cc 4x4 [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
Russ
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91 F350 crew cab 4x4 7.3 ats and intercooled with cut down 2000 ps cooler, bigger turbo comp,head studs, torque cam, coated rockers , balanced. very good power.

made 218hp/461tq on a mustang dyno lasst dec with 80k on the rebuild
pyro,boost and all stock guages ignored with mechanical real ones
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Old 03-22-2006, 07:25 PM   #4 (permalink)
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Re: 7.3IDI to T18

find you a bell housing and a single mass flywheel off a 6.9. my brother and i just finished his '78 f-250 that we put a 6.9idi in with a new process trans. it all bolted up ok. we modified the clutch linkage and the front cross member we had to cut it and lower the center to get the hood to close. then we modified the frame stands off the '85 truck we took the 6.9 out of and fit those to the frame. the radiator we used was for a big block 4 core. wire harness mods. were easy. good luck pm me if you need any help. these trucks are realy cool with a idi in them. jon


p.s. check ebay for the flywheel, bell housing, and the adapt. plate for a 4 spd. check 6.9l diesel in your search.
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Old 03-23-2006, 09:03 AM   #5 (permalink)
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Re: 7.3IDI to T18

I looked at some adapter castings at work and they seem to be the same auto or stick 6.9 or 7.3. My 2 c.
Russ
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91 F350 crew cab 4x4 7.3 ats and intercooled with cut down 2000 ps cooler, bigger turbo comp,head studs, torque cam, coated rockers , balanced. very good power.

made 218hp/461tq on a mustang dyno lasst dec with 80k on the rebuild
pyro,boost and all stock guages ignored with mechanical real ones
Fugitive sandrail. type 4 2840 turbo fi, lots of fun




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Old 03-23-2006, 07:18 PM   #6 (permalink)
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Re: 7.3IDI to T18

I'm in the middle if this swap myself for my '94. I picked up a 6.9 diesel bellhousing from a 4 speed, a Ranger III splitter, and the T-18 from my old '79 Bronco. The only issue I came across so far was the flywheel/clutch setup. I'm set on using a 12" clutch because of the turbo, so I had a little difficulty finding a setup that would work.
I've heard the 6.9's are balanced a little different from the 7.3's, so I bought a 7.3 flywheel and had a buddy drill it for the 6.9's clutch (1 1/16"-10 spline input)
If you were to run an 11" clutch, a lot of problems could be avoided, or if someone gives a definate answer that the 6.9 flywheel will work on a 7.3, then I wasted a bunch of time and money.
Keep up posted, I can't wait to have 8 forward speeds.
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Old 03-23-2006, 07:51 PM   #7 (permalink)
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Re: 7.3IDI to T18

Thanks for the help! I'm not too worried about the gears, but I just need to get things to line up.
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1979 F-250 Ranger 4x4. Dana 60 front and rear, 3.53 gears. T-18, NP205. Future show truck with 7.3 IDI.
1999 F-250 Super Duty 4x4. 7.3 PowerStroke, 3.73 gears, 6-spd manual.
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Old 03-23-2006, 10:17 PM   #8 (permalink)
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Re: 7.3IDI to T18

I believe the flywheel imbalance is different between the engines (probably due to larger pistons in the 7.3). Have the 7.3 flywheel re-balanced for the 6.9 . A shop that does such things may have the specs available. It's a matter of drilling some metal (weight) off, or welding some weight back on.

If the raw casting for the flywheel are the same (probably cast here in Cleveland where I used to work) you can compare the two and see where they are drilled different for weight. Or else the counterweight is cast larger in one than the other.
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1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.

Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.

*dual ASE Master Certified, Automotive, Medium & Heavy trucks*

Owner / operator, Patriot Automotive, N Ridgeville OH
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