Gearbox mount? - Pirate4x4.Com : 4x4 and Off-Road Forum

bludog · 08-14-2001, 08:53 AM

My FJ40 350 does not have a rear mount anywhere on the 4spd box/transfer case. It just hangs off the Bell housing with the original 4 bolts. Is this common or do most conversions have some sort of rear mount?

KrustyKruiser · 08-14-2001, 10:06 AM

Yep, pretty common, assuming your 350 bellhousing has the rear "motor" mounts also. The toy tranny and tcase were designed to be "cantilevered" off the back of the bellhousing.

08-14-2001, 07:45 PM

The old school of thought on the rear motor mount with a sbc, dealt with the type of bellhousing used. Cast Iron was ok mounted at the bellhousing, Aluminum was not. Most said the alum could not hold the weight and the bolts would pull out under the stress of the unsuported weight. That is were the transmount came about being bolted to the rear of the transfer case.

2car · 08-15-2001, 04:36 AM

Is the transmount usualy welded to the chassis? My drivetrain is unsupported too. What has become of the oldschool line of thought? Has there been an absence of failures in the aluminium bell housings?

08-15-2001, 12:46 PM

The only kits I have seen from the usual suppliers all come with the Trans/transfer mout across the back. It is supported by two L shaped brackets that are welded to the frame, very similar to the front motor mounts that weld to the frame. On my sbc, I have the cast bellhousing form a 65-67 chev truck. It has the orginal mounting location on the botom corners. However there is a major clearnace problem with the front driveline to use these mounting position. I have seen a few custom bent tubing mounts on cruisers ,but they hung down pretty low to clear the driveshaft.

08-14-2001, 08:53 AM	#1 (permalink)
bludog Registered User Join Date: Jul 2001 Member # 6084 Location: Perth, Australia Posts: 57	Gearbox mount? My FJ40 350 does not have a rear mount anywhere on the 4spd box/transfer case. It just hangs off the Bell housing with the original 4 bolts. Is this common or do most conversions have some sort of rear mount? __________________ 1975 FJ40, 350 Chev, 33 Mudders, 4" lift, Locked rear, 2" body lift And building..

08-14-2001, 10:06 AM	#2 (permalink)
KrustyKruiser Registered User Join Date: Mar 2000 Member # 474 Location: Danville, CA Posts: 3,028	Yep, pretty common, assuming your 350 bellhousing has the rear "motor" mounts also. The toy tranny and tcase were designed to be "cantilevered" off the back of the bellhousing. __________________ Rock on with the RockDogs!

08-15-2001, 04:36 AM	#4 (permalink)
2car Registered User Join Date: Jun 2001 Member # 5586 Location: Canberra, Australia Posts: 226	Is the transmount usualy welded to the chassis? My drivetrain is unsupported too. What has become of the oldschool line of thought? Has there been an absence of failures in the aluminium bell housings? __________________ 74 FJ40, 307, Hilux DBC. "Two half nuthin's make a whole nuthin'. You can argue with me, but you can't argue with science." '' _ ______ '/\|_[_____]__ \|¯[_L/-\_\|o=o\|_ ¯:__;-¯__-,==,_ ()_)O()_)O== )_)

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08-14-2001, 07:45 PM	#3 (permalink)
Larry Lee Guest Member # Posts: n/a	The old school of thought on the rear motor mount with a sbc, dealt with the type of bellhousing used. Cast Iron was ok mounted at the bellhousing, Aluminum was not. Most said the alum could not hold the weight and the bolts would pull out under the stress of the unsuported weight. That is were the transmount came about being bolted to the rear of the transfer case.

08-15-2001, 12:46 PM	#5 (permalink)
Larry Lee Guest Member # Posts: n/a	The only kits I have seen from the usual suppliers all come with the Trans/transfer mout across the back. It is supported by two L shaped brackets that are welded to the frame, very similar to the front motor mounts that weld to the frame. On my sbc, I have the cast bellhousing form a 65-67 chev truck. It has the orginal mounting location on the botom corners. However there is a major clearnace problem with the front driveline to use these mounting position. I have seen a few custom bent tubing mounts on cruisers ,but they hung down pretty low to clear the driveshaft.