The 3.91 diff has a small leak, either the bottom drain plug or at the diff plate, can't tell which. Going to reseal with loctite 5970 and put some gasoila on the drain plug. I'm hoping I can do both of these without the need to put in new oil. The current oil only has seven or eight thousand miles on it.
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2003 | 3.91 | CMP Subframe & RTAB Bushings | SMG (Relocated & Rebuilt) | ESS Gen 3 Supercharger | Redish | Beisan | GC Coilovers & ARCAs | Imola Interior | RE Rasp | RE Diablo | Storm Motorwerks Paddles | Will ZCPM3 Shift Knob | Apex ARC-8 19x9, 19x9.5 | Sony XAV-AX5000 | BAVSOUND | CSL & 255 SMG Upgrades | Tiag | Vert w/Hardtop
2005 | Slick top | Manual | Mystic | Stripper | ZCP Brakes -
Diff cover resealed and I put in a magnetic drain plug that has an o-ring this time. Coating of gasoila to go along with it.
Last edited by oceansize; 04-18-2026, 06:15 PM.2003 | 3.91 | CMP Subframe & RTAB Bushings | SMG (Relocated & Rebuilt) | ESS Gen 3 Supercharger | Redish | Beisan | GC Coilovers & ARCAs | Imola Interior | RE Rasp | RE Diablo | Storm Motorwerks Paddles | Will ZCPM3 Shift Knob | Apex ARC-8 19x9, 19x9.5 | Sony XAV-AX5000 | BAVSOUND | CSL & 255 SMG Upgrades | Tiag | Vert w/Hardtop
2005 | Slick top | Manual | Mystic | Stripper | ZCP BrakesComment
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With the Tiag's rear end dropped its time to do the same to the Mystic. All that is left is to remove the subframe bolts and lower. I'll do that tomorrow. I can see the diff has a leak, have to investigate and see where its coming from before I move this diff to the other car.
2003 | 3.91 | CMP Subframe & RTAB Bushings | SMG (Relocated & Rebuilt) | ESS Gen 3 Supercharger | Redish | Beisan | GC Coilovers & ARCAs | Imola Interior | RE Rasp | RE Diablo | Storm Motorwerks Paddles | Will ZCPM3 Shift Knob | Apex ARC-8 19x9, 19x9.5 | Sony XAV-AX5000 | BAVSOUND | CSL & 255 SMG Upgrades | Tiag | Vert w/Hardtop
2005 | Slick top | Manual | Mystic | Stripper | ZCP BrakesComment
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Second rear end dropped. The Pinion shaft seal is leaking on the diff, will replace before installing in the convertible.
Last edited by oceansize; Yesterday, 07:42 AM.2003 | 3.91 | CMP Subframe & RTAB Bushings | SMG (Relocated & Rebuilt) | ESS Gen 3 Supercharger | Redish | Beisan | GC Coilovers & ARCAs | Imola Interior | RE Rasp | RE Diablo | Storm Motorwerks Paddles | Will ZCPM3 Shift Knob | Apex ARC-8 19x9, 19x9.5 | Sony XAV-AX5000 | BAVSOUND | CSL & 255 SMG Upgrades | Tiag | Vert w/Hardtop
2005 | Slick top | Manual | Mystic | Stripper | ZCP BrakesComment
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