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Author Topic: Bellhousing swap diesel to gas etc  (Read 6940 times)
ED-NY
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« on: November 20, 2009, 07:48:36 PM »

Just visited the Diesel Doctor web site, here are a couple of posts RE: bellhousing swaps.


Message #1:
 
The 6.2 and 6.5 are the same block--and they both share the same bellhousing pattern as the gas chevy motors,no adapter needed!(you are thinking of the 5.7 litre oldsmobile motors they converted to diesel used in 78-81 GM trucks--they had the buick-olds pattern,and were JUNK!)...The 6.2 and 6.5 are true diesels,and will bolt right in place of any chevy gas motor...the torque converter has a lower stall speed on a diesel,other than that the tranny is the same as gas powered trucks....


Message #2:
Hi Chris, we have done guite a number of these swaps a few years ago. From what I remember it was really quite simple. Chevy 305 350 400 engines literally bolt right in. These engines fit the transmisson you have, if you use truck exhaust manifolds they actually fit right on the 6.2 ex. pipe flanges, use the oil filter adapter from the 6.2 on the replacement engine so you can keep using the cooler in the original radiator,you will have to do a little fabricating on the TV cable mounting bracket to get in correct position,and you will need to fabricate a bracket to hold the resivoir on the steering pump which is used from the original engine with the hydroboost unit [quite simple] use the steering pump bracket from a gas truck. we used the universal flexible type hose i belive on the upper radiator hose and got one for a gas truck on the lower,there might be a few more small details I have forgoten but for the most part it is really simple. Before you do this let me tell you that every customer I talked to afterwards regreted not going back with diesel because of the fuel mileage!
« Last Edit: January 02, 2010, 09:36:57 PM by ED-NY » Logged
merlin5577
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« Reply #1 on: November 20, 2009, 09:48:30 PM »

In regards to the transmissions, I beleive the valve body and governor are different. You can put a gas engine transmission behind a diesel, but it would last long.
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ED-NY
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« Reply #2 on: November 21, 2009, 05:37:53 PM »

Thanks...I'm going manual for in part for that reason.
« Last Edit: January 02, 2010, 09:37:22 PM by ED-NY » Logged
PeteA
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« Reply #3 on: December 01, 2009, 10:44:14 AM »

Are you going with the NV4500 trans?
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ED-NY
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« Reply #4 on: December 01, 2009, 10:48:30 AM »

Yes..going with the NV4500 in the truck. Learned that the bellhousing from the 6.5 will bolt to my 350 engine.  Just need to locate a 350 externally balanced flywheel. I have a new clutch kit ready to install.

Also learned that the 350 will bolt into the 6.5 motor (frame) mounts also.

Ed
« Last Edit: January 02, 2010, 09:35:20 PM by ED-NY » Logged
rich
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« Reply #5 on: January 02, 2010, 09:32:30 PM »

i just swapped out a 4l80e in a 96 k3500 with a nv4500 and i just wanted to add to anyone doin this job that the tranny is 1 1/2 inches shorter and the adapter to the tcase wont fit the nv4500 so i took off the adapter and mounted the tcase bolted right up to the nv4500 so i took a piece of old chrome bumper from this truck and relocated the carrier bearing ahead ,it was pretty far in the spline in the rear shaft so i got lucky and didnt need to have a new shaft made ,i also learned that with the 4l80e transmission u can use a 2wd 4l80e in a 4wd if u cut the input shaft of clean a few inches off the front shaft ,bye bye junk automatic now i have a noisy nv4500 ............ughh with 100 dollars of special gear oil in it lol
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rich
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« Reply #6 on: January 02, 2010, 09:37:20 PM »

i meant the rear output shaft on the 4l80e sorry
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ED-NY
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« Reply #7 on: January 02, 2010, 09:50:44 PM »

Thanks for the info Rich...by the way..sorry for the black font earlier. With the previous white background theme, I had my font set for black, then when I switched this entire forum to this new theme...didn't realize that I needed to change my font back to white. Roll Eyes

Anyway..glad you have the NV4500 working. I always keep extra GM crossmembers around in case you ever need one for any mods. This will be my first NV4500 and didn't realize they are also noisy. My daily driver has the NV3500. When I first got the truck I thought the tranny was shot with all the noise, then put in another and the same noise again! I finally just put in some axle lube and it makes less noise..but takes a while to warm up in the winter.

I rebuilt a T5 this last Summer...that was a piece of cake and no special tools needed, I understand the NV4500 is a bit more challenging. Trying to locate an instructional DVD for the NV4500..when I get one..I'll make it available for the forum folks.

Thanks for the info

Ed
 
Rich: What did you do for the neutral safety switch wiring related to the ECM?

« Last Edit: January 02, 2010, 10:14:54 PM by ED-NY » Logged
rich
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« Reply #8 on: January 02, 2010, 10:25:05 PM »

well im not sure if they are all noisy but mine sure is but it could be the pressure plate rattling not sure yet ,but make sure u use the special gear oil made for the new venture 4500 amsoil makes a cheaper brand and sell it on there site ,also i belive its nv4500.com that has alot of info on these transmissions ,but anyways the noise is alittle anoying ,i hope its not a bad 5th gear like the site says they go bad ,hope it is just the clutch !!! ill run it till it breaks lol ,also i found out that there is 2 different gear ratio for the nv4500 transmission
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rich
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« Reply #9 on: January 02, 2010, 10:31:44 PM »

ohh also the crossmember is in the right spot u just need the 4500 trans mount that bolts to the two front holes in the cross member ,its the rear shaft that is to short and where the carrier bearing bolts up u dont have the 1 1/2 inches to move it forward so i made a small bracket from an old chrome bumper and drilled the 4 holes in it ,looks nice and shiny under there lol
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rich
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« Reply #10 on: January 02, 2010, 10:44:48 PM »

for the ecm issue i lucked out and got the whole wirring harness and ecm from the 4500 ,let me tell u that the nuteral saftey switch has a heck of a lot less wires than the 4l80e lol ,accually if i remember it right its just has a reverse wire that goes to the tranny and the clutch peddle saftey wire ,id have to say but not really sure that the ecms are different
,
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BigBlockV6GMC
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« Reply #11 on: January 06, 2010, 11:24:29 AM »

Sound's like its working out ok then ?

apparently my photo doesn't work of something. . .

Mike
« Last Edit: January 06, 2010, 11:28:05 AM by BigBlockV6GMC » Logged

1953 Studebaker M275.
1962 GMC K3000.
1969 AMC AMX-390.
1977 Ford F350.
1982 AMC/Jeep J-5500.
1982 AMC Eagle SX/290.
1988 AMC/Jeep MJ-343.
1992 GTA Trans AM.
2007 Honda Rubicon TRX500.
ED-NY
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« Reply #12 on: January 06, 2010, 12:04:18 PM »

Mike: Is this the photo?

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BigBlockV6GMC
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« Reply #13 on: January 06, 2010, 12:30:57 PM »

Yup that's the big block V6, i was hopping to have used it for my avatar, but it wouldn't link. . .

Mike
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1953 Studebaker M275.
1962 GMC K3000.
1969 AMC AMX-390.
1977 Ford F350.
1982 AMC/Jeep J-5500.
1982 AMC Eagle SX/290.
1988 AMC/Jeep MJ-343.
1992 GTA Trans AM.
2007 Honda Rubicon TRX500.
BigBlockV6GMC
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Age: 33
Location: Madison,WI
Posts: 115


AMC & GMC powered !


« Reply #14 on: January 06, 2010, 12:46:39 PM »

Quote

The 6.2 and 6.5 are the same block--and they both share the same bellhousing pattern as the gas chevy motors,no adapter needed!(you are thinking of the 5.7 litre oldsmobile motors they converted to diesel used in 78-81 GM trucks--they had the buick-olds pattern,and were JUNK!)...The 6.2 and 6.5 are true diesels,and will bolt right in place of any chevy gas motor...the torque converter has a lower stall speed on a diesel,other than that the tranny is the same as gas powered trucks....

 Cry of course they used the same tranny's GM's Gas engine's are by far stronger then there Diesel engine's Wink

I have a 6.5L turbo charge V-8 that runs on diesel fuel in a 95' K2500 that struggles to tow 4,500lb's, yet i have a 6.2L V-6 Gas engine in a 62' K3000 = 1.25ton that will tow 22,000lb's all day long and not notice its there, tho the K3000 is manual transmissioned truck and the K2500 is an auto transed truck.

But i have owned K2500's with 350 n 454 TBI's 4spd automatic's n 4.10's never had the mount of trouble i have had with the 6.5, I actually had a C2500 with 305TBI 4spd auto and 3.73's that out towed my 6.5 with 4.10's, power wise for sure swap that diesel out of there reliability swap that diesel out of there, if fuel mileage is a concern then leave the diesel.

only advantage to a 6.5 is mileage, other then that the con's are: cost more to fix break more often have no pulling power unless geared really low which then starts to reduce the pro of the 6.5 fuel mileage. . .

report back when you conversion is done i may need you to walk me through it on my K2500.

Mike
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1953 Studebaker M275.
1962 GMC K3000.
1969 AMC AMX-390.
1977 Ford F350.
1982 AMC/Jeep J-5500.
1982 AMC Eagle SX/290.
1988 AMC/Jeep MJ-343.
1992 GTA Trans AM.
2007 Honda Rubicon TRX500.
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