similar parts

is there a list of parts that are simliar between the CGT and the BGT?

watusi ebc Wrote:

Taylor,
It might be easier to list the parts that are different between the B and C. In general:
All the sheet metal from the firewall forward, except the fenders.
The floor pans, cross member and front suspension.
The floor carpet/mats (to accommodate the different floor pans).
All the engine, and emissions, parts, except perhaps the oil pressure sender and temp sender.
The transmission case, gears and layshaft. Perhaps other transmission parts. (The overdrive is the same as the B's).
The driveshaft (the C's is thicker walled).
The radiator, oil cooler hoses, and entire brake system and clutch system.
The windshield washer bottle.
The rear differential gears.
The parking brake cable.
The lower seat frames (shorter to accommodate the higher floor pans).
The speedometer (140mph on the C) and tachometer (different redline).
The main wiring loom. The rear wiring loom may be the same.
The wheels (15" on the C versus 14" on the B to clear the bigger rotors).
That little emblem on the rear that says "MGC-GT". :)
Hope this helps,
Bill

I should have posed the question that way. Thanks for the answer.

I got my Moss catalog today, which means the Victoria British should follow soon. And, speaking of parts, anyone have an extra manual transmission for sale or trade?

Taylor...you have a PM....

oops- sorry- commented on another thread

Hubs and rotors??

Not the same from what I can tell. Splines look to be the same for the wheels.

Hubs, both front and rear, are essentially identical except for the 4-bolt vs. 5-bolt difference. There is even a CGT in the Portland area that has MGB front and rear hubs on it. Hub bearings are the same.
Front rotors and calipers are the same as Austin Healey 3000 Mk III after mid-1964.
Rear hubs will all interchange, MGB, MGC, wire and bolt on. Cut off the splines and you have a disc wheel hub. The rear wire wheel hub is essentially identical to the Healey rear wire wheel bolt on adaptor (which is almost the same as the TR adaptor for all 4 hubs) with the added splines in the center to fit the MG axle shaft.
There are only two Rudge-Whitworth type splines for Dunlop wire wheels, Jaguar size and everyone else. Even the Italian Borani wire wheels used the same size as MG.
Transmission internals are essentially the same as MGB except for ratios. Standard MGC 4-speed has different ratios than MGB and MGC 4-speed with overdrive has another set of ratios (called a close-ratio set.)
The MGC used the LH type overdrive, but I don't think the MGB got that overdrive until several years later.
I think the tunnel and most of the firewall is the same, but there may be differences around the starter. Everything forward of that point is different except for the fenders, grill and lights.

The LH type overdrive was used on the MGB from 1968 on, same time as the all-synchro gearbox.
The MGC's splines are the same size as the MGB's but the MGC hubs, front and rear, have five studs to mount the rotor and brake drum where as the MGB's only has four. The MGC rotor, brake drum, and rear brake mounting plate are all different from the MGB.

Front hubs differ from the MGB as the register for the brake disk differs by about 1/4", in addition to the bolt pattern differences. The hub/rotor units are interchangeable as a unit, but the caliper mounts on the swivel axle are different. If you replace swivel axles, hubs rotors, & calipers (different bolt pitch), that parts group will interchange as an assembly on the MGC kingpin.

MGC transmission outpit flange is different than the MGB, as is the rear axle input flange. Results in dufferent driveshaft.

My experience with MGC gearboxes is that the non-O/D has the same ratios as the MGB- but these transmissions were bought used, so who knows what happened to them in a past life. The MGC O/D boxes have the more preferred (IMO) intermediate ratio boxes (approximately 3:1 first gear)


Ummm...

What was the question again?