Interestingly enough, the SU-76I, designed as a stopgap measure during the most difficult time for Soviet tank production, continued fighting until at least 1944. The 7th Mechanized Corps lists 13 "SU-76 on T-3 chassis" (compared to only 11 SU-76 on T-70 chassis) among its vehicles (CAMD RF 3436-1-57). However, the comments on its performance weren't exactly great:
"By the start of the operation, all vehicles were ready for battle and moved out to initial positions, except SU-76 SPGs on the T-3 chassis, which did not reach the battlefield and got stuck on insignificant inclines.
...
The battle completely confirmed the low battlefield value of the SU-76 on the T-3 chassis: bad maneuverability, low off-road performance."
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Via altyn73.
"By the start of the operation, all vehicles were ready for battle and moved out to initial positions, except SU-76 SPGs on the T-3 chassis, which did not reach the battlefield and got stuck on insignificant inclines.
...
The battle completely confirmed the low battlefield value of the SU-76 on the T-3 chassis: bad maneuverability, low off-road performance."
A rare photo of a SU-76I in the wild.
Via altyn73.